SPIRIT Athletics
St. Marcellinus offers a wide range of interschool sports. Below is a list of sports currently offered at the school:
| Fall Season | Winter Season | SpringSeason |
| Jr. Lady Spirit Basketball | Sr. Boys Hockey | Jr. Boys Soccer |
| Sr. Lady Spirit Basketball | Jr. Boys Hockey | Sr. Boys Soccer |
| Jr. Football | Varsity Girls Hockey | Jr. Girls Soccer |
| Sr. Football | Skiing | Sr. Girls Soccer |
| Golf | Swimming | Track and Field |
| Tennis | Special Events Soccer | Badminton |
| Jr. Boys Volleyball | Jr. Boys Basketball | Special Events Track |
| Sr. Boys Volleyball | Sr. Boys Basketball | Varsity Boys Baseball |
| Cross Country | Sr. Girls Volleyball | Varsity Girls Slo-Pitch |
| Cheerleading | Jr. Girls Volleyball |