Grand River Collegiate Institute is a public secondary school in Kitchener, Ontario.

It is part of the Waterloo Region District School Board.

As the fifth collegiate in Kitchener-Waterloo, Grand River Collegiate (GRCI) was built on Indian Road near the Grand River in Kitchener's eastern area.

Grand River Collegiate Institute has had seven principals: Grand River has athletic groups which include: alpine skiing, badminton, basketball, cross-country, curling, field hockey, football, golf, ice hockey, Nordic skiing, rugby, soccer, tennis, track & field and volleyball, and wrestling.

[3] Grand River's sports teams are known as the Renegades (commonly shortened to the "Rens").