| John A Sprague | |
| John A. Grabowski | Finger Lakes
16-Jun-26,
Sugar Ride |
| John A. Hancock | Churchill Downs
18-Jun-26,
Listentourmother |
| John A. Shirreffs | Santa Anita
19-Jan-26,
Misleading |
| John A. Stinebaugh | Remington Park
31-May-26,
Curls Magic Wagon |
| John Alexander Ortiz | Horseshoe Indianapolis
23-Jun-26,
Covert Law |
| John Allen | Bairnsdale
12-Jun-26,
Gentleman Jim |
| John Allred | Turf Paradise
25-Mar-26,
Letsjustsay |
| John Anthony Leblanc | Fair Grounds
15-Feb-25,
Cookn Wit Catman |
| John Askevold | Albany
27-Apr-17,
Olaf |
| John B Scott | Bowraville
24-Sep-16,
Rodeo Hotshot |
| John Bannister | Coonabarabran
20-Jun-26,
Think I'M In |
| John Barr | Townsville
20-Dec-22,
Roc De Khaper |
| John Bary | Hastings
21-May-26,
Seaduction |
| John Bateman | Goulburn
18-Dec-20,
Agent Gibbs |
| John Beagan | Muswellbrook
04-Jan-10,
Foreignfarewell |
| John Bernard | Fair Grounds
09-Mar-26,
Billy Bowlegs |
| John Berry | Newmarket
20-Jun-26,
Clasina |
| John Betts | |
| John Blackadder | Riccarton Park
20-Jun-26,
Tavi Ann |
| John Blacker | Hobart
21-Jun-26,
Daytona Diva |
| John Boegner | Lone Star Park
15-Nov-25,
Gladiator |
| John Booker | Kempsey
08-Nov-19,
Mymatemitch |
| John Borham | Moruya
23-Jan-26,
Devgru |
| John Bourke | Moree
17-Dec-22,
Charming Sam |
| John Bowtell | Pinjarra Park
15-Jun-17,
It's All an Act |
| John Braithwaite | Strathalbyn
02-Jun-11,
PULSING |
| John Brennan | Wangaratta
06-Dec-16,
Rhonda in Paris |
| John Brooks | Casterton
07-Jun-26,
Royal Attire |
| John Brown | Mountaineer
30-Jun-25,
Ry's Revenge |
| John Byrne | Kilcoy
20-Dec-19,
Backup Billy |
| John C. Carlisle | Charles Town
14-Jun-26,
Starcastle |
| John C. Ivory | Santa Anita
01-Jun-26,
Mperfection |
| John C. Kimmel | Aqueduct
17-Jan-26,
R U Bluffing |
| John C. Schultz | Horseshoe Indianapolis
14-Jun-26,
Martine |
| John C. Servis | Monmouth Park
22-Jun-26,
Resolute |
| John C. Wainwright | Fairmount Park
21-Jun-26,
Strope |
| John Cane | Pinjarra
23-Mar-25,
Angel Academy |
| John Cannon | Thistledown
03-Jul-25,
Riesenberg |
| John Carlisle | Charles Town
29-Jun-25,
Eccentric |
| John Carlo Iuele | Gawler
06-Jan-16,
Bowtale |
| John Castleman | Mildura
12-Mar-17,
Arandom |
| John Charalambous | Woodbine
19-May-25,
Boston Tea Party |
| John Chilcott | Ascot
13-Dec-14,
Rubykon Lass |
| John Collison | Narromine
22-Jun-26,
Battle Reign |
| John Coolahan | Echuca
03-Aug-09,
INVASIVE ROSE |
| John Cooper | Newcastle
13-Jun-26,
Line Of Fire |
| John Cornell | Port Augusta
09-Apr-17,
Belgietto |
| John Corriveau | Thistledown
15-Oct-25,
Rivers Angel |
| John Cortez | Los Alamitos Racecourse
05-Jul-25,
Carver |
| John Coryat | Woodbine
17-May-25,
Six For A Nine |
| John Cox | Oaklawn Park
03-May-25,
Quick Buck |
| John Crane | Rockhampton
28-Feb-19,
I Trust Layla |
| John Croucher | Balaklava
18-Jun-25,
Prance 'N' Dance |
| John Cullen | Sligo
03-May-26,
Cornmarket |
| John D Pearson | Wangaratta
06-Dec-25,
Sir William Bruce |
| John D. Hammes | Remington Park
31-May-26,
Jess Want To Know |
| John Dann | Ipswich
20-Jun-26,
Quothquan |
| John Dawson | Uttoxeter
14-Jun-26,
Shinealight |
| John Delahunty | Oakley
11-May-24,
Lanzoffany |