Nave has buttresses and 2 C15 windows with double cinquefoil-headed lights below and four trefoil-headed lights above.
C19 decorative ridge tiles.
North side has triangular buttresses, one elaborate C15 window and 2 cinquefoil headed lights.
Font of Purbeck marble, an octagonal bowl with 2 flat blank arches to each side and 1 late C18 and 1 early C19 marble wall plaque.
Nave south window has original fragments of medieval stained glass (angels).
SZ4985 : St Olave, Gatcombe: stained glass window (ii)
Chancel arch C13 with pointed arch on octagonal piers, flanked by C20 pointed arches.
Very fine C19 glass, the east window the Last Supper and the two Marys at the Sepulchre and the Ascension in the north wall by William Morris, the Crucifixion in the East. window by Rossetti and the Entombment in the East window by Ford Madox Brown and the Lamb and Angels in the East window and the Baptism in the South wall by Burne Jones. (B.O.E. Hampshire and the Isle of Wight: 745).