O'Hara Hall is located on the south side of campus near the Chapel of Mary, the Martin Institute and the new Science Center.

A traditional corridor-style hall, O'Hara houses approximately 250 first year residents and is co-ed by wing with three male wings and five female wings. Most rooms in O'Hara are double occupancy. O'Hara features a large common lounge at the front the building, two kitchens, a laundry room and a game room.