Royal Navy Submarines O

Oberon	Olympus S-12	Orpheus	Otus
(O Class)	(Oberon Class)	(O Class Odin Group)	(Oberon Class)

Oberon S-09	Onslaught S-14	Orpheus S-11	Otus
(Oberon Class)	(Oberon Class)	(Oberon Class)	(O Class Odin Group)

Ocelot S-17	Onyx S-21	Osiris	Otus S-18
(Oberon Class)	(Oberon Class)	(O Class Odin Group)	(Oberon Class)

Odin	Opossum S-19	Osiris S-13	Otway
(O Class Odin Group)	(Oberon Class)	(Oberon Class)	(O Class Oxley Group)

Odin S-10	Opportune S-20	Oswald	Oxley
(Oberon Class)	(Oberon Class)	(O Class Odin Group)	(O Class Oxley Group)

Olympus	Oracle S-16	Otter S-15
(O Class Odin Group)	(Oberon Class)	(Oberon Class)

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