Box of folded ship plans, in the sequence Ormonde - Oxna
-Ormonde (1918) - fleet sweeping sloop
-Oronsay (HMT) (1943)
-Orotavia & Oruba (1899)
-Orpheus (1916)
-Orpheus (submarine) (1929)
-Orsay (1945)
-Orwell (1942)
-Orwell (1953)
-Osiris (1916)
-Osiris (submarine) (1928)
-Ossory (1916)
-Ossory (1944)
-Oswald (submarine) (1928)
-Othello (1941)
-Otway (HMAS) (submarine) (1928)
-Otway (HMAS) (submarine) (1926)
-Oudernade (motorbarge) (1937)
-Oxford Castle, Pevensey Castle, Arnprior (HMCS), Petrolia (HMCS) (1943/44) (Castle class corvette)
-Oxley (RANS) (submarine) (1926)
-Oxna (HMT) (trawler)