| OATES WILFRED LAWSON | 18733 | Pte | 10 Duke of Wells(S)K-3 69 Bde 23 Div |
| O'BRIEN DENNIS | 3790 | Pte | E Lancs 1/5th TF 126 Bde 42(E Lan)Div |
| O'BRIEN JAMES | 50376 | Pte | 9 Suffolk R(S)K-3 71 Bde 24 Div |
| O'CONNOR CHARLES | 40342 | Pte | 2/6 Lancs Fus TF 197 Bde 66(2 E Lan)Div * |
| O'CONNOR JOHN | 160084 | Dvr | 49 Bty RFA (Reserve) |
| ODDIE ALBERT | 94618 | Pte | Liverpools 1/7th TF 165 Bde 55(West Lan)Di |
| ODDIE AMBROSE | 34818 | Pte | Lancs Fus 12th |
| ODDIE BERTIE | 96549 | Pte | 4 Kings L'Pool R(Extra Reserve) Btn 98B 33 D |
| ODDIE JAMES HENRY | 9587 | Pte | Cheshires 1st (TMB) 15 Bde 5 Div |
| ODDIE JOHN HENRY | 243838 | Cpl | 1/5 Loyal NLR 170 Bde 57(W Lan) Div |
| O'DONNELL JAMES (served as Quinn) | 7091 | Pte | 1 Connaught Rangers 3rd (Lahore)Div |
| O'DRISCOLL MICHAEL John | 24814 | Cpl | 9 Dublin Fus(S)K-2 48 Bde 16(Irish)Div |
| OGDEN HAROLD | 260119 | Pte | 8 Borderers (S)K-3 75 Bde 25 Div * |
| OGDEN PETER | 34922 | Pte | E Lancs 2nd 24 Bde 23 Div |
| OGLE ERNEST DALE | 66804 | Gnr | RGA 91st Siege Btty |
| O'HARA EDWARD | 6137 | Pte | E Lancs 6th (S)K-1 38 Bde 13(Western)Div |
| O'HARA ROBERT | 20609 | Sgt | 1 Wiltshre R 110 Bde 21 Div |
| O'HARA THOMAS | 5873 | Pte | E Lancs 8th (S) K-3 74 Bde 25 Div |
| OLDCORNE NATHANEL | 30591 | S/Sgt | RAMC |
| OLDFIELD JOHN THOMAS | 6261 | Pte | 1/4 Loyal NLR TF 164 Bde 55(W Lan)Div |
| OLDFIELD THOMAS HENRY | 14763 | Pte | 8 Devon R (S)K-1 20 Bde 7 Div |
| OLDHAM WILLIAM JOHN | 13940 | Pte | 10 Cameronians C Coy(Scots R)(S)K-2 46B 15 D |
| OLDMAN FRANK STUART | 16071 | Pte | 10 Cameronians(Scots R)(S)K-2 46 Bde 15 Div |
| ORANGE JAMES | 3973 | Dvr | 1st Australion Fld Artillery+Div Signal Coy |
| ORMEROD ANDREW | 2/Lt | RFA 6th Bty 130 Howitzers att 59 Sq RFC | |
| ORMEROD ARTHUR ALBERT | 6685 | Pte | E Lancs 2nd 24 Bde 8 Div |
| ORMEROD HARRY | 28817 | Pte | E Lancs 2nd 2nd Bde 8 Div |
| ORMEROD HARRY | 35021 | Pte | 16 Lan Fus(S)(2rd Salford) 96 Bde 32 Div |
| ORMEROD JOHN WILLIAM | 7778 | Pte | 1 Black Watch 1 Bde 1 Div |
| ORMEROD THOMAS | 9902 | A/Cpl | 11 Manchester R(S)K-1 34 Bde 11 Div |
| ORMEROD TOM | 28749 | Pte | E Lancs 2nd 25 Bde 8 Div |
| ORMEROD WHITHAM | 20153 | Pte | E Lancs 2nd 24 Bde 23 Div |
| ORMEROD WILLIAM | 19764 | Pte | E Lancs 6th (S)K-1 38 Bde 13(Western)Div |
| ORR JOHN | 1248 | Pte | E Lancs 1/5th TF 126 Bde 42(E Lan)Div |
| ORRELL E | 137408 | Pte | MGC (Inf) |
| OVEREND JONATHAN | 22543 | Pte | 1 KOYLI 83 Bde 28 Div |
| OWEN HARRY | 2318 | Pte | E Lancs 1/5th TF 126 Bde 42(E Lan)Div |
| OWEN JOSEPH | 5770 | L/Cpl | R Dublin Fus 1st 86 Bde 29 Div |
| OWEN RICHARD | 6220 | Sgt | R Innskilling Fus 2nd 109 Bde 36 Div |