| Calvert High School | |
| Established: | 1923[1] |
| Type: | Private, coeducational |
| Religion: | Roman Catholic |
| Grades: | Pre-K–12 |
| Head Of School: | Jeremy Marinis [2] |
| Principal: | Megan Schultz (Academy & High School), Marilyn Seislove (Elementary) |
| Chaplain: | Father Matt Rader [3] |
| Conference: | Sandusky Bay Conference |
| Colors: | Royal blue and white |
| Team Name: | Senecas |
| Streetaddress: | 152 Madison Street |
| City: | Tiffin |
| State: | Ohio |
| Zipcode: | 44883 |
| Country: | United States |
| Coordinates: | 41.1136°N -83.1744°W |
Calvert High School is a private, Catholic high school in Tiffin, Ohio. It is part of the Roman Catholic Diocese of Toledo. Athletic teams are known as the Senecas.
Since the 2021 school year, grades preschool through fifth have met at the Calvert Elementary Campus, while the Academy and Calvert High School houses students in grades six through twelve.[4] Calvert Catholic High School is a faith-based program. With having a mass once a week with extra services throughout the year. They allow the students to participate in the S.E.A. program, STEAM program, Advanced Placement courses, Sentinel Career and Vocational School, and the College Credit Plus program. Calvert offers students interested in attending to schedule a tour, or have a shadow day where they get the full experience of how a day at Calvert goes.