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Alpha Tau Omega (ΑΤΩ), commonly known as ATO, is an American social fraternity founded at the Virginia Military Institute in 1865. The fraternity has around 250 active and inactive chapters and colonies in the United States and has initiated more than 250,000 members. VMI Cadets are no longer associated with the fraternity. In 1885, the VMI Board of Visitors ruled that cadets could no longer join fraternities, based on the belief that allegiance to a fraternal group undermined the cohesiveness of and loyalty to the Corps of Cadets.
Alpha Tau Omega represents one-third of the Lexington Triad, along with Kappa Alpha Order and Sigma Nu. The Fraternity does not have chapters or affiliations outside the United States. The fraternity's non-profit organization is The ATO Foundation, which provides scholarships to its members.