| Etobicoke Collegiate Institute | |
| Former Name: | Etobicoke High School (1928-1949) |
| Address: | 86 Montgomery Road |
| Country: | Canada |
| Coordinates: | 43.6502°N -79.5224°W |
| Type: | Public High School |
| Motto: | Semper Ad Meliora |
| Motto Translation: | Always Towards the Better |
| Religious Affiliation: | Secular |
| Pushpin Map: | Canada Toronto#Ontario#Canada |
| Founded: | 1928 |
| Schoolboard: | Toronto District School Board |
| District: | Etobicoke |
| Superintendent: | Alison Gaymes San Vicente |
| Trustee: | Dan MacLean |
| Number: | 2802 / 909572 |
| Principal: | Jennifer Kurtz |
| Staff: | 105 |
| Grades: | 9-12 |
| Enrolment: | 1390 |
| Enrolment As Of: | 2023-24 |
| Conference: | TDSAA, OFSAA-"AAAA" |
| Colors: | Garnet, green and gold |
| Mascot: | Ram (Ruckus the Ram) |
| Team Name: | Etobicoke Rams |
Etobicoke Collegiate Institute (ECI, Etobicoke CI), previously known as Etobicoke High School is a high school in Toronto, Ontario, Canada. It is located in the Islington neighbourhood of the former suburb of Etobicoke. It is overseen by the Toronto District School Board. The school was founded in 1928 and was part of the former Etobicoke Board of Education until 1998.
Etobicoke High School was founded in the fall of 1928. It is one of Toronto's oldest schools and the first and traditionally central school for Etobicoke, having celebrated its 75th anniversary in 2003. The school was renamed to Etobicoke Collegiate Institute in 1949.
The 1928 entrance is an example of Art Deco architecture. The high school has about 1,450 students and over 100 teachers. Etobicoke Collegiate Institute is also the second-surviving high school in Etobicoke after the now-defunct Mimico High School (whose building now houses John English Junior Middle School).
E.C.I's traditional rivals are Richview Collegiate Institute, about north. The two schools compete in football and other sports and share a somewhat similar socioeconomic demographic. The school building has been a shooting location for a few films and commercials, including Mean Girls in 2003 and the made-for-television movie, Young Again, starring Keanu Reeves, in 1986.
The Etobicoke Collegiate Institute extracurricular activity list stretches from music to most sports to Eco Club, Social Justice Club and Intereact.
Etobicoke Collegiate's Student Administrative Council is made up of 10 elected student leaders.