Union College competes in NCAA Division III (with football).
| Name | Participants | |
|---|---|---|
| Men | Women | |
| Baseball | 33 | 0 |
| Basketball | 16 | 14 |
| All Track Combined | 85 | 49 |
| Field Hockey | 0 | 18 |
| Football | 101 | 0 |
| Golf | 0 | 10 |
| Ice Hockey | 28 | 21 |
| Lacrosse | 43 | 29 |
| Rowing | 28 | 37 |
| Soccer | 35 | 28 |
| Softball | 0 | 14 |
| Swimming and Diving | 13 | 14 |
| Tennis | 12 | 11 |
| Volleyball | 0 | 15 |