| Labor | R 24 |
| Laddie Boy | R 46 |
| Lady Mohr | R 45 |
| Lady Naomi | R 48 |
| Lady Paramount | R 48 |
| Lagunita | R & M 32 |
| Lancaster | R 49 |
| Le Neige | R 24 |
| Late Sun | R 48 |
| Le Correge | S 48 |
| Lent A. Williamson | S 50 |
| Lenzschnee | R 24 |
| Leonard de Vinci | S 49 |
| Leonidas | L 24 |
| Le Poussin | S 24 |
| Le Titien Vilmorin | S 48 |
| Leverrier | S 36 |
| Libra | R & M 44 |
| Lighthouse | R ± 50 |
| Lights On | R ± 48 |
| Little Elsa | R 40 |
| Little Jewel | R 40 |
| L. Merton Gage | R 48 |
| Lodestar | R 25 |
| Lord Dongan | R ± 48 |
| Lord of June | S, R 48 |
| Loreley | S 24 |
| Los Angeles | R 49 |
| Loute | S 33 |
| Louvois | R 48 |
| Lucero | R 50 |
| Lucrezia Bori | R ± 48 |
| Lurida Minor | R & M 45 |
| Lutea | R 40 |