Slavery in India is evidenced since ancient times.  Manu the Lawgiver, in his Manu Smriti lists seven different kinds of slaves.  The nature of slavery in India was extremely complex and cut across boundaries of caste, gender, kin, religion, and role. 
The early Arab invaders of Sind in the 8th century, the armies of the Umayyad commander Muhammad bin Qasim, are reported to have enslaved tens of thousands of Indian prisoners, including both soldiers and civilians. In the early 11th century Tarikh al-Yamini, the Arab historian Al-Utbi recorded that in 1001 the armies of Mahmud of Ghazna conquered Peshawar and Waihand (capital of Gandhara) after Battle of Peshawar (1001), "in the midst of the land of Hindustan ", and captured some 100,000 youths. Later, following his twelfth expedition into India in 1018–19, Mahmud is reported to have returned with such a large number of slaves that their value was reduced to only two to ten dirhams each. This unusually low price made, according to Al-Utbi, "merchants [come] from distant cities to purchase them, so that the countries of Central Asia, Iraq and Khurasan were swelled with them, and the fair and the dark, the rich and the poor, mingled in one common slavery". Elliot and Dowson refers to "five hundred thousand slaves, beautiful men and women.". Later, during the Delhi Sultanate period (1206–1555), references to the abundant availability of low-priced Indian slaves abound. Levi attributes this primarily to the vast human resources of India, compared to its neighbors to the north and west (India's Mughal population being approximately 12 to 20 times that of Turan and Iran at the end of the 16th century).
The Siddi are an ethnic group inhabiting India and Pakistan. Members are descended from Bantu peoples from Southeast Africa that were brought to the Indian subcontinent as slaves by Arab and Portuguese merchants. 
Much of the northern and central parts of the subcontinent was ruled by the so-called Slave Dynasty of Turkic origin from 1206 to 1290: Qutb-ud-din Aybak, a slave of Muhammad Ghori rose to power following his master's death. For almost a century, his descendants ruled presiding over the introduction of Tankas and building of Qutub Minar.
According to Sir Henry Bartle Frere (who sat on the Viceroy's Council), there were an estimated 8,000,000 or 9,000,000 slaves in India in 1841. In Malabar, about 15% of the population were slaves. Slavery was officially abolished in India by the Indian Slavery Act V. of 1843. Provisions of the Indian Penal Code of 1861 effectively abolished slavery in India by making the enslavement of human beings a criminal offense.    
There are an estimated five million bonded workers in Pakistan, even though the government has passed laws and set up funds to eradicate the practice and rehabilitate the labourers.  As many as 200,000 Nepali girls, many under 14, have been sold into sex slavery in India. Nepalese women and girls, especially virgins, are favored in India because of their fair skin and young looks.   In 1997, a human rights agency reported that 40,000 Nepalese workers are subject to slavery and 200,000 kept in bonded labour.  Nepal's Maoist -led government has abolished the slavery-like Haliya system in 2008. 
According to a report of an expedition to Afghanistan published in London in 1871:
- "The country generally between Caubul ( Kabul) and the Oxus appears to be in a very lawless state; slavery is as rife as ever, and extends through Hazara, Badakshan, Wakhan, Sirikul, Kunjūt ( Hunza), &c. A slave, if a strong man likely to stand work well, is, in Upper Badakshan, considered to be of the same value as one of the large dogs of the country, or of a horse, being about the equivalent of Rs 80. A slave girl is valued at from four horses or more, according to her looks &c.; men are, however, almost always exchanged for dogs. When I was in Little Tibet ( Ladakh), a returned slave who had been in the Kashmir army took refuge in my camp; he said he was well enough treated as to food &c., but he could never get over having been exchanged for a dog, and constantly harped on the subject, the man who sold him evidently thinking the dog the better animal of the two. In Lower Badakshan, and more distant places, the price of slaves is much enhanced, and payment is made in coin."
In response to the Hazara uprising of 1892, the Afghan Emir Abdur Rahman Khan declared a " Jihad " against the Shiites. His large army defeated the rebellion at its center, in Oruzgan, by 1892 and the local population was being massacred. According to S. A. Mousavi, "thousands of Hazara men, women, and children were sold as slaves in the markets of Kabul and Qandahar, while numerous towers of human heads were made from the defeated rebels as a warning to others who might challenge the rule of the Amir" . Until the 20th century, some Hazaras were still kept as slaves by the Pashtuns ; although Amanullah Khan banned slavery in Afghanistan in the 1923 Constitution,  the practice carried on unofficially for many more years. 
Slavery throughout pre-modern Chinese history has repeatedly come in and out of favor. Due to the enormous population and relatively high development of the region throughout most of its history, China has always had a large workforce.
The Tang dynasty purchased Western slaves from the Radanite Jews.  Tang Chinese soldiers and pirates enslaved Koreans, Turks, Persians, Indonesians, and people from Inner Mongolia, central Asia, and northern India.     The greatest source of slaves came from southern tribes, including Thais and aboriginals from the southern provinces of Fujian, Guangdong, Guangxi, and Guizhou. Malays, Khmers, Indians, and black Africans were also purchased as slaves in the Tang dynasty. 
Many Han Chinese were enslaved in the process of the Mongols invasion of China proper. According to Japanese historian Sugiyama Masaaki (杉山正明) and Funada Yoshiyuki (舩田善之), there were also certain number of Mongolian slaves owned by Han Chinese during the Yuan dynasty. Moreover, there is no evidence that Han Chinese, who were considered people of the bottom of Yuan society by some research, were suffered a particularly cruel abuse.
In the 17th century Qing Dynasty, there was a hereditarily servile people called Booi Aha (Manchu:booi niyalma; Chinese transliteration: 包衣阿哈), which is a Manchu word literally translated as "household person" and sometimes rendered as " nucai ".
In his book China Marches West , Peter C. Perdue stated:"In 1624(After Nurhachi's invasion of Liaodong) "Chinese households....while those with less were made into slaves."  The Manchu was establishing close personal and paternalist relationship between masters and their slaves, as Nurhachi said, "The Master should love the slaves and eat the same food as him". Perdue further pointed out that booi aha "did not correspond exactly to the Chinese category of "bond-servant slave" (Chinese:奴僕); instead, it was a relationship of personal dependency on a master which in theory guaranteed close personal relationships and equal treatment, even though many western scholars would directly translate "booi" as "bond-servant" (some of the "booi" even had their own servant).  
- Various classes of Booi
- booi niru a Manchu word (Chinese:包衣佐領), meaning Neiwufu Upper Three Banner's platoon leader of about 300 men .
- Booi guanlin a Manchu word (Chinese:包衣管領), meaning the manager of booi doing all the domestic duties of Neiwufu.
- Booi amban is also a Manchu word, meaning high official, (Chinese:包衣大臣).
- Estate bannerman (Chinese:庄头旗人) are those renegade Chinese who joined the Jurchen, or original civilians-soldiers working in the fields. These people were all turned into booi aha , or field slaves.
Chinese Muslim (Tungans) Sufis who were charged with practicing xiejiao (heterodox religion), were punished by exile to Xinjiang and being sold as a slave to other Muslims, such as the Sufi begs. 
Han chinese who committed crimes such as those dealing with opium became slaves to the begs, this practice was administered by Qing law.  Most Chinese in Altishahr were exile slaves to Turkestani Begs.  Ironically, while free Chinese merchants generally did not engage in relationships with East Turkestani women, some of the Chinese slaves belonging to begs, along with Green Standard soldiers, Bannermen, and Manchus, engaged in affairs with the East Turkestani women that were serious in nature. 
The Qing dynasty procured 420 women and girl slaves, all of them Mongol, to service Oirat Mongol bannermen stationed in Xinjiang in 1764.  Many Torghut Mongol boys and girls were sold to Central Asian markets or on the local Xinjiang market to native Turkestanis. 
Here are two accounts of slavery given by two Westerners in the late 19th century and early 20th century:
"In the houses of wealthy citizens, it is not unusual to find twenty to thirty slaves attending upon a family. Even citizens in the humbler walks of life deem it necessary to have each a slave or two. The price of a slave varies, of course, according to age, health, strength, and general appearance. The average price is from fifty to one hundred dollars, but in time of war, or revolution, poor parents, on the verge of starvation, offer their sons and daughters for sale at remarkably low prices. I remember instances of parents, rendered destitute by the marauding bands who invested the two southern Kwangs in 1854–55, offering to sell their daughters in Canton for five dollars apiece. . . .
The slavery to which these unfortunate persons are subject, is perpetual and hereditary, and they have no parental authority over their offspring. The great-grandsons of slaves, however, can, if they have sufficient means, purchase their freedom. . . .
Masters seem to have the same uncontrolled power over their slaves that parents have over their children. Thus a master is not called to account for the death of a slave, although it is the result of punishment inflicted by him."
"In former times slaves were slain and offered in sacrifice to the spirit of the owner when dead, or by him to his ancestors: sometimes given as a substitute to suffer the death penalty incurred by his owner or in fulfilment of a vow. It used to be customary in Kuei-chou (and Szü-chuan too, I believe) to inter living slaves with their dead owners; the slaves were to keep a lamp burning in the tomb....
"Slavery exists in China, especially in Canton and Peking.... It is a common thing for well-to-do people to present a couple of slave girls to a daughter as part of her marriage dowery [sic]. Nearly all prostitutes are slaves. It is, however, customary with respectable people to release their slave girls when marriageable. Some people sell their slave girls to men wanting a wife for themselves or for a son of theirs.
"I have bought three different girls: two in Szü-chuan for a few taels each, less than fifteen dollars. One I released in Tientsin, another died in Hongkong; the other I gave in marriage to a faithful servant of mine. Some are worth much money at Shanghai."
All forms of slavery have been illegal in China since 1910, although the practice still exists through illegal trafficking in some areas.
Throughout the 1930s and 1940s the Yi people (also known as Nuosu) of China terrorized Sichuan to rob and enslave non-Nuosu including Han people. The descendants of the Han Chinese slaves are the White Yi (白彝) and they outnumber the Black Yi (黑彝) aristocracy by ten to one.  As much as tens of thousands of Han slaves were incorporated into Nuosu society every year. The Han slaves and their offspring were used for manual labor.  There is a saying goes like: "the worst insult to a Nuosu is to call him a "Han" (with the implication being that "your ancestors were slaves")". 
Slavery in Japan was, for most of its history, indigenous, since the export and import of slaves was restricted by Japan being a group of islands. The export of a slave from Japan is recorded in a 3rd-century Chinese document, although the system involved is unclear. These people were called seiko ( 生口 ) , lit. "living mouth". "Seiko" from historical theories are thought to be as prisoner, slave, a person who has technical skill and also students studying abroad to China.
In the 8th century, a slave was called nuhi ( 奴婢 ) and a series of laws on slavery was issued. In an area of present-day Ibaraki Prefecture, out of a population of 190,000, around 2,000 were slaves; the proportion is believed to have been even higher in western Japan.
Slavery persisted into the Sengoku period (1467–1615), but the attitude that slavery was anachronistic had become widespread. Oda Nobunaga is said to have had an African slave or former-slave in his retinue.  Korean prisoners of war were shipped to Japan as slaves during the Japanese invasions of Korea in the 16th century.  
In late-16th-century Japan, slavery was officially banned; but forms of contract and indentured labor persisted alongside the period penal codes' forced labor. Somewhat later, the Edo period penal laws prescribed "non-free labor" for the immediate family of executed criminals in Article 17 of the Gotōke reijō (Tokugawa House Laws), but the practice never became common. The 1711 Gotōke reijō was compiled from over 600 statutes promulgated between 1597 and 1696. 
World War II
As the Empire of Japan annexed Asian countries, from the late 19th century onwards, archaic institutions including slavery were abolished in those countries. However, during the Second Sino-Japanese War and the Pacific War, the Japanese military used millions of civilians and prisoners of war as forced labor, on projects such as the Burma Railway.
According to a joint study by historians including Zhifen Ju, Mitsuyoshi Himeta, Toru Kubo and Mark Peattie, more than 10 million Chinese civilians were mobilized by the Kōa-in (Japanese Asia Development Board) for forced labour.  According to the Japanese military's own record, nearly 25% of 140,000 Allied POWs died while interned in Japanese prison camps where they were forced to work (U.S. POWs died at a rate of 37%).  More than 100,000 civilians and POWs died in the construction of the Burma-Siam Railway.  The U.S. Library of Congress estimates that in Java, between 4 and 10 million romusha (Japanese: "manual laborer"), were forced to work by the Japanese military.  About 270,000 of these Javanese laborers were sent to other Japanese-held areas in South East Asia. Only 52,000 were repatriated to Java, meaning that there was a death rate of 80%. (For further details, see Japanese war crimes.) 
Approximately 5,400,000 Koreans were conscripted into labor from 1944 to 1945 by the National Mobilization Law. About 670,000 of them were brought to Japan, where about 60,000 died between 1939 and 1945 due mostly to exhaustion or poor working conditions. Many of those taken to Karafuto Prefecture (modern-day Sakhalin) were trapped there at the end of the war, stripped of their nationality and denied repatriation by Japan; they became known as the Sakhalin Koreans.  The total deaths of Korean forced laborers in Korea and Manchuria for those years is estimated to be between 270,000 and 810,000. 
The Joseon dynasty of Korea was a hierarchical society that consisted of social classes. Cheonmin, the lowest class, included occupations such as butchers, shamans, prostitutes, entertainers, and also members of the slave class known as nobi . Low status was hereditary, but members of higher classes could be reduced to cheonmin as a form of legal punishment. During poor harvests and famine, many peasants voluntarily sold themselves into the nobi class in order to survive.  The nobi were socially indistinct from freemen other than the ruling yangban class, and some possessed property rights, legal entities and civil rights. Hence, some scholars argue that it's inappropriate to call them "slaves",  while some scholars describe them as serfs.   The nobi population could fluctuate up to about one-third of the population, but on average the nobi made up about 10% of the total population.  In 1801, the vast majority of government nobi were emancipated,  and by 1858 the nobi population stood at about 1.5 percent of the total population of Korea.  The hereditary nobi system was officially abolished around 1886–87 and the rest of the nobi system was abolished with the Gabo Reform of 1894,  but traces remained until 1930.
There was a large slave class in Khmer Empire who built the enduring monuments in Angkor and did most of the heavy work.  Slaves had been taken captive from the mountain tribes.  People unable to pay back a debt to the upper ruling class could be sentenced to work as a slave too.  Between the 17th and the early 20th centuries one-quarter to one-third of the population of some areas of Thailand and Burma were slaves. 
In Siam (Thailand), the war captives became the property of the king. During the reign of Rama III (1824–1851), there were an estimated 46,000 war slaves. Slaves from independent hill populations were "hunted incessantly and carried off as slaves by the Siamese, the Anamites, and the Cambodians" (Colquhoun 1885:53).  Slavery was not abolished in Siam until 1905. 
Yi people in Yunnan practiced a complicated form of slavery. People were split into the Black Yi (nobles, 7% of the population), White Yi (commoners), Ajia (33% of the Yi population) and the Xiaxi (10%). Ajia and Xiaxi were slave castes. The White Yi were not slaves but had no freedom of movement. The Black Yi were famous for their slave-raids on Han Chinese communities. After 1959 some 700,000 slaves were freed.   
Slaves in Toraja society in Indonesia were family property. Sometimes Torajans decided to become slaves when they incurred a debt, pledging to work as payment. Slaves could be taken during wars, and slave trading was common. Torajan slaves were sold and shipped out to Java and Siam. Slaves could buy their freedom, but their children still inherited slave status. Slaves were prohibited from wearing bronze or gold, carving their houses, eating from the same dishes as their owners, or having sex with free women—a crime punishable by death. Slavery was abolished in 1863 in all Dutch colonies.  
The U.S. Library of Congress estimates that in Java, between 4 and 10 million romusha (Japanese: "manual laborer") were forced to work by the Japanese military. About 270,000 of these Javanese laborers were sent to other Japanese-held areas in South East Asia. Only 52,000 were repatriated to Java, meaning that there was a death rate of 80%.
Slavery in pre-Spanish Philippines was practiced by the tribal Austronesian peoples who inhabited the culturally diverse islands. The Muslim states established in the southern Philippines and northern Indonesia moving ahead of the Portuguese advance from the west conducted slave raids from the 1600s into the 1800s in coastal areas of the Gulf of Thailand and the Philippine islands to provide a laborforce for harvesting tropical products in Borneo for the China trade. Spain finally succeeded in the mid-1800s in cutting off these raids through use of steam-powered warships. (See Thomas H. McKenna, Muslim Rulers and Rebels , University of California Press, 1998; and James Francis Warren, "The Port of Jolo and the Sulu Zone Slave Trade," The Journal of Sophia Asian Studies No. 25 , 2007: .)
Within the Asia-Pacific region, there were as of 2015 an estimated 11.7 million trafficked people; within the Asia Pacific, the Greater Mekong Subregion (GMS), which includes Cambodia, China, Laos, Burma (Myanmar), Thailand and Vietnam, "features some of the most extensive flows of migration and human trafficking."  Industries with major problems with human trafficking and forced labor in Southeast Asia include fisheries, agriculture, manufacturing, construction and domestic work.  The child sex trade has also plagued southeast Asia, where "[m]ost sources agree that far more than 1 million underage children are 'effectively enslaved'" as of 2006. 
According to the International Labour Organization (ILO), an estimated 800,000 people are subject to forced labor in Myanmar.  In November 2006, the International Labour Organization announced it will be seeking "to prosecute members of the ruling Myanmar junta for crimes against humanity" over the continuous forced labor of its citizens by the military at the International Court of Justice. 
As of end-2015, Singapore has acceded to international standards of prosecuting and convicting human traffickers under the United Nations Protocol to Prevent, Suppress and Punish Trafficking in Persons, especially Women and Children. 
In the time of the Crimean Khanate, Crimeans engaged in frequent raids into the Danubian principalities, Poland-Lithuania, and Muscovy. For each captive, the khan received a fixed share (savğa) of 10% or 20%. The campaigns by Crimean forces categorize into "sefers", officially declared military operations led by the khans themselves, and çapuls , raids undertaken by groups of noblemen, sometimes illegally because they contravened treaties concluded by the khans with neighbouring rulers. For a long time, until the early 18th century, the khanate maintained a massive Slave Trade with the Ottoman Empire and the Middle East. Caffa was one of the best known and significant trading ports and slave markets.  Crimean Tatar raiders enslaved more than 1 million Eastern Europeans. 
Central Asia and the Caucasus
Russian conquest of the Caucasus led to the abolition of slavery by the 1860s   and the conquest of the Central Asian Islamic khanates of Bukhara, Samarkand, and Khiva by the 1870s.  The Russian administration liberated the slaves of the Kazakhs in 1859.  A notorious slave market for captured Russian and Persian slaves was centred in the Khanate of Khiva from the 17th to the 19th century.  During the first half of the 19th century alone, some one million Persians, as well as an unknown number of Russians, were enslaved and transported to Central Asian khanates.  When the Russian troops took Khiva in 1898 there were 29,300 Persian slaves, captured by Turkoman raiders. According of Josef Wolff (Report of 1843–1845) the population of the Khanate of Bukhara was 1,200,000, of whom 200,000 were Persian slaves.  At the beginning of the 21st century Chechens and Ingush kept Russian captives as slaves or in slave-like conditions in the mountains of the northern Caucasus.