| Marianapolis Preparatory School | |
| Streetaddress: | 26 Chase Road |
| County: | Windham County |
| State: | Connecticut |
| Zipcode: | 06277 |
| Country: | US |
| Type: | Private, boarding, coeducational |
| Religion: | Roman Catholic |
| Trustee: | The Trinity Foundation |
| Ceeb: | 070780 |
| Head Of School: | David DiCicco |
| Chaplain: | Timothy Roth |
| Teaching Staff: | 45 |
| Grades: | 9–12, postgraduate |
| Avg Class Size: | 14 |
| Ratio: | 7:1 |
| Athletics: | Soccer, basketball, volleyball, cross country, wrestling, track and field, indoor track and field, ultimate frisbee, tennis, golf, baseball, softball, lacrosse, crew, badminton, equestrian, dance, gymnastics, martial arts, yoga, swimming, field hockey |
| Conference: | NEPSAC |
| Mascot: | Knight |
| Team Name: | The Golden Knights |
| Accreditation: | New England Association of Schools and Colleges[1] |
| Tuition: | $18,793 (day); $57,898 (residential) |
| Campus Type: | Rural |
| Campus Size: | 150acres |
| Colors: | Maroon and gold |
| Enrollment: | 345 |
| Enrollment As Of: | 2019-2020 |
| Free Label: | Gender ratio |
| Free Text: | 47% male, 52% female, 1% nonbinary |
Marianapolis Preparatory School is a private, co-educational, Catholic high school located in Thompson, Connecticut.