Founders League
The Founders League is an American athletic league comprising a number of college preparatory schools. Founded in 1984, it consists of ten schools in Connecticut and one from eastern New York. All of the schools in the Conference are founding members. The League is one of eleven in the New England [Preparatory School Athletic Council].
Members
| School | Mascot | Location | Founded | Grades | Enrollment | Colors | Varsity Teams | Rivals |
| Avon Old Farms School | Winged Beavers | Avon, CT | 1927 | 9-12 | 408 Boys | 15 | Westminster | |
| Choate Rosemary Hall | Wild Boars | Wallingford, CT | 1890 | 9-12 | 865 | 32 | Deerfield | |
| The [Ethel Walker School] | Wild Cats | Simsbury, CT | 1911 | 6-12 | 258 Girls | 13 | Miss Porters | |
| The Hotchkiss School | Bearcats | Lakeville, CT | 1891 | 9-12 | 599 | 17 | Taft | |
| Kent School | Lions | Kent, CT | 1906 | 9-12 | 570 | 23 | Loomis Chaffee | |
| Kingswood Oxford School | Wyverns | West Hartford, CT | 1909 | 6-12 | 499 | 26 | - | |
| Loomis Chaffee School | Pelicans | Windsor, CT | 1874 | 9-12 | 716 | 29 | Kent | |
| Miss Porter's School | Daisies | Farmington, CT | 1843 | 9-12 | 333 Girls | 18 | Ethel Walker | |
| The Taft School | Rhinos | Watertown, CT | 1890 | 9-12 | 595 | 27 | Hotchkiss | |
| Trinity-Pawling School | Pride | Pawling, NY | 1907 | 7-12 | 325 Boys | 13 | Avon Old Farms | |
| Westminster School | Martlets | Simsbury, CT | 1888 | 9-12 | 390 | 16 | Avon Old Farms |