The UT local fraternity Omega Beta Sigma was granted a charter at the 1924 Phi Sigma Kappa convention. A petition had been presented by a local fraternity at UT in 1876 but was refused because at that time Phi Sigma Kappa planned to confine its extension to the New England area. Xi Deuteron Chapter of Phi Sigma Kappa was installed at UT in 1925. Its philanthropy is Special Olympics. Phi Sigma Kappa was founded at the Massachusetts Agricultural College in Amherst, Massachusetts, in 1873. For five years it had no exoteric name and was generally known as The Three T’s. The colors of the fraternity are red and silver, and the mascot is the Raiders. Traditions of the institution include the Carnation Ball, “Nightmare” Masquerade Party, and spring outing at Lea Lakes. Among notable alumni of the national organization are Dick Endberg, Don Knotts, Frank Gifford, Dan Patrick, Jack Welch, and Tom Smothers.
In 1926 Phi Sigma Kappa was the first UT fraternity to build a house designed especially for fraternity use. In 1958 it was the first UT fraternity to adopt a child through the Foster Parents Plan. Contributions of Phi Sigma Kappa supported a 13-year-old Vietnamese boy for a year.
In 1993 fraternity members were ordered to move out of the house it rented from UT and to close the house because of structural problems, such as crumbling mortar and fire code noncompliance. The fraternity reorganized in summer 1993 under the direction of the national fraternity.