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Oak, HMS (1912)
Oakland, USS (CL-95)
O'Bannon, USS (DD-177)
O'Brien Class Destroyers
O'Brien, USS (DD-51)
O'Brien, USS (DD-415)
Obdurate, HMS (1916)
Obedient, HMS (1915)
Oberon, HMS (1916)
Observer, HMS (1916)
Ocean, HMS
Octavia, HMS (1916)
Offa, HMS (1916)
OKA-38 Aist/ ShS
Oklahoma, USS (BB 37)
Oklahoma City, USS (CL-91)
Omaha Class Cruisers
Omaha, USS (CL-4)
Onager
Onslaught, HMS (1915)
Onslow, HMS (1916)
Opal, HMS (1915)
Ophelia, HMS (1915)
Opi
Opossum, HMS (1895)
Opportune, HMS (1915)
Oracle, HMS (1915)
Orcadia, HMS (1916)
Ordnance, 7.2in Howitzer Mk I-V
Ordnance, 7.2in Howitzer Mk 6
Ordnance, BL 2.75in mountain gun
Ordnance, BL 5-in field howitzer
Ordnance, BLC 15-pounder field gun
Ordnance, jointed BL 10-pounder mountain gun
Ordnance, QF 2.95in mountain gun (pack howitzer)
Ordnance, QF 3.7in mountain or pack howitzer
Ordnance, QF 4.5in field howitzer
Ordnance, QF 15-pounder Ehrhardt (QF 15-pounder Mark I)
Ordnance QF 18-pounder field gun Mk I
Ordnance QF 18-pounder field gun Mk IV
Ordronaux, USS (DD-617)
Oregon City, USS (CA-122)
Orion class battleships
Orwell, HMS (1898)
Osborne, USS (DD-295)
Osmond Ingram, USS (DD-255/ AVD-9/ APD-35)
Osprey, HMS (1897)
Ostrich, HMS (1900)
Ostwind I/ Flakpanzer IV/3.7cm FlaK
Ostwind II/ Flakpanzer IV/ 3.7cm Flakzwilling
OT-26 Flamethrower Tank
OT-34 Flamethrower Tank
OT-130 Flamethrower Tank
OT-133 Flamethrower Tank
OT-134 Flamethrower Tank
Otter, HMS (1896)
Otter Light Reconnaissance Car (Canada)
Ouse, HMS (1905)
Overton, USS (DD-239/ APD-23)
Owl, HMS (1913)