Aston Rowant is 5 miles S of Thame, in the far E of Oxfordshire, near the Buckinghamshire border and the edge of the Chilterns. The large church is of flint with stone dressings, comprising a chancel, nave with chapels on N and S sides, a S porch and a W tower. The N and S walls of the nave date from the 11thc. or early 12thc., when it was probably a two-cell structure. In the S wall of the nave there is a round-headed Romanesque window in its original position, just above and W of a 13thc. doorway. In the N wall of the N aisle is a similar window and a plain Romanesque doorway, both moved from their original position in 1874 when that part of the N nave wall was demolished. They are now in their equivalent positions in the new wall of the N aisle, and directly opposite the round-headed window and later S doorway.