The Alpha Delta Phi Fraternity House was a historic fraternity house located at the University of Illinois at Urbana–Champaign in Champaign, Illinois. The house was built in 1924-25 for the university's chapter of the Alpha Delta Phi fraternity, which formed in 1903. During its early years, the fraternity's members included several prominent university athletes. Architect Ralph W. Varney designed the building in the Tudor Revival style. The house's design reflected the formal Jacobethan subtype of Tudor Revival architecture, which could be seen in its extensive stone decorations on its brick exterior, such as quoins and oriels, and its steep gable roof with gabled dormers. Half-timbering, a common feature of informal Tudor Revival designs, was notably absent.