| St. David Catholic Secondary School | |
| Address: | 4 High Street |
| Country: | Canada |
| Coordinates: | 43.4843°N -80.5294°W |
| Schooltype: | Catholic (Separate Board) |
| Founded: | 1965 |
| Principal: | David Jaeger |
| Grades: | 9-12 |
| Enrollment: | 1045 |
| Language: | English |
| Colours: | Green, Blue and White |
| Mascot: | Cedric |
| Team Name: | Celtics (/selt(iks)/) |
St. David Catholic Secondary School, established in 1965, is a Roman Catholic high school instructing students from grades 9 to 12. St. David CSS is located in Waterloo, Ontario and is a member of the Waterloo Catholic District School Board. Its building is the oldest secondary school building in the board. Historically, it served as a junior high school, instructing students from grades 7 to 10. In 1985, St. David received full funding from the Ontario Ministry of Education, due to the school changing its educational focus to students in grades 9 to OAC. Since the OAC year of secondary school was phased out of Ontario schools in the 2002-2003 school year, St. David CSS now teaches grades 9 through to 12. At present (2011) St. David educates 1045 students. St. David is named after St David, a 6th-century saint.
The school's principal is David Jaeger.[1]
The school has approximately 84 full-time teaching staff.
As with the other secondary schools in the Waterloo Catholic District School Board, St. David requires all students to wear a uniform every day, excepting the occasional dress-down day (known to staff and students as "Civies Day").[2]