List of World War One tanks by name - O
Obadiae 9848
Oban 9832
Och Aye Mk V*
8th August 1918 - 15 Battalion - In action, see narrative for details. (W15a)
Octopus 9846
O'Dawina 9814
Odiam 9791
Odysseus 9839
Oh I say Mk I (f)
A Photograph of the name, HMLS "Oh I Say" on a camouflaged female Mk I tank: IWM Q 3543:
https://www.iwm.org.uk/collections/item/object/205236077
Old Emma Mk IV
Either 2700 or 2037, B Battalion, 5 Company, 5 Section, in action 7 June 1917.
Old It 9860
Old Nick 9811
Ole Luk Oie Mk I
19 Apr 17 – m, "Gaza" tank - 2Lt
Farquhar-Thompson – Broke down just after start.
Olga 9835
Omagh 9824
Omar 9831
Omar-Ama 9851
Omniscient 9837
Omnivorous 9535
Onslaught 9540
Onward 9509
Oodradata 9536
Opamonda 9836
Oppier 9539
Oppossum 9550
Oppressor Mk V*
8th August 1918 - 15 Battalion - In action, see narrative for details. (W15a)
Optimist 9825
Orby 9843
Orient 9834
Orion 9828
Oroola 9551
Orpheus 9547
Orrong 9544
Orrono 9530
Ot Stuff 9817
Otazel 9841
Otazel Mk I
19 Apr 17 – m, "Gaza" tank - 2 Lt Blakeway – 155 Brigade Attacked ditched + recovered.
Ottama 9543
Oukaparinga Mk V*
8th August 1918 – 15 Battalion, Group A2, O14, 2Lt Kerfoot, in action, see narrative for details (W15a)
Ournan 9833
Overland 9847