HMS Opportune (S20)
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British Porpoise-class submarine
HMS Odin (S10)
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List of submarine classes
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HMS Sealion
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Submarine squadron
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Explorer-class submarine
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HMS Oberon (S09)
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HMCS Okanagan
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HMS Onslaught (S14)
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HMCS Ojibwa
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HMCS Onondaga
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HMS Onyx (S21)
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Oberon-class submarine
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Porpoise-class submarine
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List of submarines of the Royal Navy
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Tang-class submarine
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List of submarine classes of the Royal Navy
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HMAS Ovens
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HMAS Orion
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HMAS Otama
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HMS Ocelot
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English Electric
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Gavin Menzies
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List of ship names of the Royal Navy
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Amphion-class submarine
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HMS Grampus
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Type XXI submarine
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