Index - O
OA-1, British Burnelli OA-1
Osprey, Hawker Osprey
Overstrand, Boulton Paul Overstrand  (Boulton Paul P.75 Overstrand)
Owlet, General Aircraft Owlet  (General Aircraft GAL.45 Owlet)
Oxford, Airspeed Oxford  (Airspeed AS.10 Oxford)