Uline is a privately held United States company which offers shipping and other business supplies. It has approximately 6,000 employees and is headquartered in Pleasant Prairie, Wisconsin. Uline has distribution centers in Chicago, Minneapolis, Allentown, Los Angeles, Atlanta, Dallas, Seattle, Toronto, Edmonton, Vancouver, Mexicali, and Monterrey.

Uline was founded in 1980 by Liz and Richard Uihlein.^[1] After recognizing a local need for a shipping supply distributor, the Uihleins started Uline from their basement. The company's first product was the H-101 carton sizer.^[2] It sold well and encouraged the Uihleins to add more products to the catalog the following year.

In 2014, the privately held company was estimated to have $2 billion in revenue^[3] and has more than 6,000 employees.^[1] Liz Uihlein is reported to be more active in the company than her husband. The Uihleins' son, Brian, also works for Uline.^[1] The company requires men to wear ties; tattoos are discouraged.^[1] The company is not believed to have a communications department and maintains a low profile on social media, but does advertise extensively online.^[1] Liz's letters in the catalog sometimes have a political message.^[1]

The Uline headquarters is located on 200 acres (81 ha) in Pleasant Prairie, Wisconsin.^[1] The headquarters has two buildings, a 279,000 square feet (25,900 m2) facility and a newer (2016) building of 300,000 square feet (28,000 m2).^[1][4]

As of August 2019, Uline has distribution centers in all three of the North American Free Trade Agreement countries.^[2] In the United States: the Wisconsin headquarters warehouses; Chicago; Minneapolis; Allentown; Los Angeles; Atlanta; Dallas and Seattle. In Canada: Toronto and Edmonton. In Mexico: Mexicali and Monterrey.