William Malcolm Hailey, 1st Baron Hailey OM GCSI GCMG GCIE PC (15 February 1872 – 1 June 1969), known as Sir Malcolm Hailey between 1921 and 1936, was a British peer and administrator in British India.

Hailey was a graduate of Corpus Christi College, Oxford, having been educated at Merchant Taylors' School, Northwood, and entered the Indian Civil Service in 1896.

Hailey College of Commerce is a constituent undergraduate, graduate, and post-graduate college of the University of the Punjab in Lahore, Punjab, Pakistan. Established on 4 March 1927 after the name of Sir Malcolm Hailey, the then Governor of the Punjab and the Chancellor of the university. It is the oldest specialized institution of commerce in Asia.

Hailey was Governor of the Punjab from 1924 to 1928, a compromiser with the Akali leadership,^[1] and Governor of the United Provinces 1928 to 1934. He was early convinced of the strength of Indian nationalism, but remained ambivalent about it.^[2]

He was appointed a CIE in 1911, a Companion of the Order of the Star of India in 1915, a Knight Commander of the Order of the Indian Empire 1921 and appointed a Knight Grand Cross of the Order of the Indian Empire in 1928 and a Knight Grand Cross of the Order of the Star of India in 1932. In 1936, while he was the Governor of United Provinces, India's oldest national park was created and was named Hailey National Park in his honour (later renamed Jim Corbett National Park). The same year, he was raised to the peerage as Baron Hailey, of Shahpur in the Punjab and Newport Pagnell in the County of Buckingham.^[3] In 1937 he was elected President of the Royal Asiatic Society of Great Britain and Ireland. ^[4] In 1939 he was made a GCMG.

He subsequently spent time on missions to Africa, producing the African Survey in the late 1930s that proved very influential.^[5] He advised limited recognition of African national movements.^[6] He was invited to a meeting by the Secretary of State for the Colonies, Malcolm MacDonald, in 1939 at which the setting up of the Colonial Social Science Research Council was discussed. In 1942 he was appointed to lead the British Colonial Research Committee.^[7]

In 1948, he was made a member of the Privy Council. His powers of speaking and intellectual synthesis were widely recognised.^[8] He became a member of the Order of Merit in 1956.

Hailey also served as a Trustee of The Rhodes Trust from 1941-1964.

Malcolm Hailey married Andreina Alesandra Balzani in 1896.^[9]

Lord Hailey died in 1969 aged 97. With his death, the barony became extinct, as his only son and heir, Alan Hailey (1900–1943) had been killed without issue in the Middle East during the Second World War.