Old Engineering Hall is an academic building at 3943 O'Hara Street on the campus of the University of Pittsburgh in Pittsburgh, Pennsylvania, United States. The building was completed for $1.2 million($10.6 million today) in October, 1955. The seven floor building connects Allen Hall and Thaw Hall, as well as the Van de Graaff Building which was added later. The frieze around the top of the building includes bas-relief of the insignia of several engineering societies. Originally called Engineering Hall, it initially contained engineering offices, classrooms, laboratories, a library, and in the basement, a wind tunnel for the aeronautical engineering department testing of airfoil surfaces.