Langdon Hall, Greek Revival building on the Auburn University campus in Auburn, Alabama, United States

Langdon Hall is a Greek Revival building of 1846, moved to the Auburn University campus in 1883 and reassembled to plans by W. D. Wood. Its half-century-old tower was removed and the building bricked in 1892. It now holds an auditorium and office space for university staff.

The building was originally constructed in 1846 as a chapel for Auburn Female College and was relocated to Auburn University campus in 1883. During the Civil War, it served a medical function caring for military personnel.

The building is named for Charles Carter Langdon, a former Mobile mayor, Alabama secretary of state and Auburn trustee from 1872 to 1889; it took the name in 1889. In the early 20th century it was the campus social centre, hosting classes, motion pictures, commencement exercises, music performances and pep rallies. Its auditorium showed 'free movies' from the 1970s to the 1990s.

Langdon Hall stands on the Auburn University campus, within the Auburn University Historic District. The auditorium and staff offices are working university spaces, so access follows campus building hours rather than a visitor schedule. The building is reached on foot from the surrounding campus core; check current campus access rules before planning a stop.

The lower level of the 1846 chapel held the Female College's chemistry laboratory, which professor John M. Darby expanded in the 1850s to produce his patent disinfectant, Darby's Prophylactic Fluid. When the East Alabama Male College opened in 1859, Darby taught joint chemistry classes there with Female College students.