| O'rigsby | Mountaineer Park,
10-Jul-24 |
| O'riordan | Wingatui,
17-Oct-25 |
| O'ROADIE | |
| O'ryon | Vaal,
28-Sep-23 |
| O'sasha | Ipswich,
09-Aug-13 |
| O'SHANNASSEY | |
| O'sheamus | Warwick Farm,
06-Oct-25 |
| O'so Demanding | Goulburn,
08-May-25 |
| O'so Tempting | York,
06-Mar-23 |
| O'solexi | Orange,
21-Mar-21 |
| O'spacehello | Ipswich,
25-Oct-17 |
| O'ssitot | Salon-De-Provence,
15-May-25 |
| O'tartan Lass | Gosford,
19-Feb-22 |
| O'tauto | Flemington,
12-Dec-20 |
| O'tenikwa | Greyville,
12-Oct-25 |
| O'thunder | bet365 Geelong Synthetic,
30-Aug-16 |
| O'tonda | |
| O'Toole | Ayr,
02-Jan-25 |
| O'trouble | Belmont At The Big A,
12-May-24 |
| O'tycoon | Alice Springs,
26-Oct-25 |
| O'Vaticano | Broome,
13-Jun-15 |
| O'well | Port Lincoln,
27-Dec-16 |
| O'whatapicture | Murray Bridge Gh,
05-Feb-25 |
| O'witchway | Hobart,
04-Sep-16 |
| O'wood | ParisLongchamp,
05-Oct-25 |
| O'ziggy | Rosehill Gardens,
16-Aug-25 |
| Oa Eye Of King | Ruidoso Downs,
08-Jun-25 |
| Oahu | Cagnes-sur-Mer,
03-Jan-24 |
| Oahu Flavor | Ohi,
03-Sep-25 |
| Oahu Gaze | Wagga,
19-Feb-22 |
| OAHU GEM | Fannie Bay,
20-Nov-10 |
| Oak 'n' Arthur | Eagle Farm,
16-Jul-16 |
| Oak Alley | Keeneland,
25-Oct-25 |
| Oak Allye | Bath,
17-Jul-24 |
| Oak And Malt | Kawasaki,
05-Mar-25 |
| Oak Beach | Mornington,
23-Oct-25 |
| Oak Bridge | Ararat,
27-Nov-23 |
| Oak Creek | Wincanton,
13-Jan-24 |
| Oak Creek Gal | Los Alamitos Racecourse,
03-Nov-25 |
| Oak Dam | Morphettville,
31-Jul-21 |
| Oak Door | The Valley,
07-Sep-19 |
| Oak Grove | Ascot,
22-Nov-24 |
| Oak Hill | Moonee Valley,
06-Sep-25 |
| Oak Hill | Deauville,
13-Aug-23 |
| Oak Hill Lg | Fair Grounds,
01-Mar-25 |
| Oak Hill Seniorita | Fair Grounds,
07-Mar-25 |
| Oak Hill Solution | Fair Grounds,
27-Jan-24 |
| Oak Island | Cranbourne,
09-Dec-22 |
| Oak Lahoma | Chantilly,
30-Jun-24 |
| Oak Loves A Fight | Belmont Park,
07-May-23 |
| Oak Park Goblet | Moonee Valley,
05-Sep-15 |
| Oak Park Maddison | Morphettville,
25-Oct-25 |
| Oak Park Rebel | Murtoa,
04-Oct-25 |
| Oak Rich | Kochi,
17-Jun-23 |
| Oak Ridge | Busan,
14-Jun-24 |
| Oak Street | Eagle Farm,
23-Jun-12 |
| Oak Street Beach | Del Mar,
28-Aug-23 |
| Oak Tree Hero | Lone Star Park,
10-Oct-25 |
| Oak Wood | Pau,
19-Jan-24 |
| Oakbank Reign | Gawler,
25-May-16 |