Williams College competes in NCAA Division III (with football).
| Name | Participants | |
|---|---|---|
| Men | Women | |
| Baseball | 27 | 0 |
| Basketball | 15 | 12 |
| Field Hockey | 0 | 25 |
| Football | 76 | 0 |
| Golf | 16 | 9 |
| Ice Hockey | 24 | 23 |
| Lacrosse | 37 | 24 |
| Rowing | 39 | 40 |
| Skiing | 16 | 23 |
| Soccer | 27 | 28 |
| Softball | 0 | 19 |
| Squash | 18 | 14 |
| Swimming and Diving | 33 | 30 |
| Tennis | 15 | 13 |
| Track and Field, Indoor | 64 | 53 |
| Track and Field, Outdoor | 65 | 51 |
| Track and Field, X-Country | 40 | 40 |
| Volleyball | 0 | 13 |
| Wrestling | 22 | 0 |