From Jerripedia
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For participants from these families, please visit the individual family pages
| O'Brien | Odell | Ogier | Olliver | Orange |
| Orchard | Orviss | Osborne | Osment | Ozard |
| Ozouf |
- O’Connor, Bryan Victor , Lieutenant , RFA , From St Martin, OV
- O’Connor, Donald Neil , Second Lieutenant , 8th Gurkha Rifles , From Grouville, OV
- Oberle, Albert Armand , Private , Zululand MR , From St Saviour, OV
- Oberle, Lucien Joseph , Lieutenant , SA Defence Force , Artillery , From St Saviour, OV
- O'Brien, James Thomas , Mercantile Marine , Born Jersey, 1873
- O'Bryen, James , Mercantile Marine , Born Jersey, 1859
- O'Connell, Edward Maurice , Private , Australian Infantry , 9th Battalion
- Offret, François , Private , Dorset Regiment , From St Helier
- O'Halloran, Frederick , Lance Corporal , Northumberland Fusiliers
- Oldham, Eric Charles , MiD , Captain , RGA , From St Saviour, Ex-RMIJ
- Oldridge, Albert Edward , Sergeant , Royal Army Service Corps
- Oldridge, Alfred , 1914 Star , Warrant Officer Class 1 , Royal Army Service Corps ,
- Oldridge, Edith Esther, British Red Cross Society
- Oldridge, Elie Thomas , Private , From St Helier, Canada
- Oldridge, James Henry , 1914 Star , Captain , Buckinghamshire Yeomanry
- Oldridge, Lilian Ruth, British Red Cross Society
- Oldridge, Walter Philip , MiD, 1914-15 Star , Sergeant Major , RAMC , Born St Helier, 14 Aug 1884
- Oldridge, William Thomas , Private , From St Helier, Canada
- Olivry, Peter , Mercantile Marine , Born Jersey, 1884
- Olleriou, Albert Louis M , Private , RMIJ , 3rd) Battalion , Militia Service Only
- Olsen, John Bosdet , Corporal , Canadian Engineers , Signals , From St Peter, Ex-RMIJ
- Olsen, Julius Harold Oscar Charles , Private , Dorsetshire Regiment , From St Peter, Ex-1RMIJ
- Olsen, Ole Lars , 1914-15 Star , Colour Sergeant , Royal Irish Rifles , From St Peter, Ex-1RMIJ
- Omnes, Francis , Trooper , 16th Lancers
- O'Neill, Louisa, British Red Cross Society
- Ordinaire, Claude Victor , Private , Hampshire Regiment , From St Helier, Ex-3RMIJ, Ex-RJGB
- Ordinaire, George Louis Cassimire , 1914-15 Star , Sapper , Royal Engineers , Signals , Born St Helier, 13 Jan 1893 Died Poplar, London 1942.
- Organ, Charles Alexander , DSO, MiD (2) , Lieutenant Colonel , Royal Army Service Corps , OV
- Organ, William H , Lieutenant , Special List , OV
- Osborne-Smith, Edward , DSO, 1914 Star , Lieutenant Colonel , Northamptonshire Regiment , 1st Battalion , Born in Canada, married in 1897, Christine Caroline Le Couteur. Son Robert, born in Jersey, in 1908
- Osmand, George Frederick , Ordinary Seaman , RN , HMS Caroline , From St Helier. Son of Sgt GJF Osmand (JROH)
- Osmand, James Spencer , Able Seaman , RN , HMS Caroline , From St Helier. Son of Sgt GJF Osmand,
- Osmotherly, Ivan , Private , Born Bodmin 31 Jan 1895, Resident in St Saviour, Ex-2RMIJ
- Ounan, Arthur Harold , Mercantile Marine , Born Jersey, 1901
- Ounan, Sydney Albert , Private , Gordon Highlanders , From St Helier
- Ounan, Thomas Peter , Mercantile Marine , Born Jersey, 1872
- Owen, Guy , Private , Royal Scots , 3rd Battalion , Born St Helier, 1 Jun 1887, died 26 Jun 1917
