Governor Simcoe Secondary School, named after John Graves Simcoe, is a public high school in St. Catharines, Ontario, Canada. It is a three-floored school with a theatre attachment. It opened in 1971. It was the first open concept high school in the Niagara Peninsula; the open concept has since been replaced with individual classrooms.

In 1995, the Grantham Theatre was added to the east end of the school. While originally designed to seat 1000 people, due to budget constraints, it was only built to seat 500.

The school has had its own productions of musicals. In 2017, students performed Beauty and the Beast. 66 students were a part of the cast. In 2019, students performed Into the Woods.

The school has a robotics team which is number 1114 in the FIRST Robotics Competition. In 2017, two students on the team were photographed with prime minister Justin Trudeau. In 2022, they won the Ontario provincial championship and then competed in Houston, Texas.

In 2014, students from Governor Simcoe won 11 medals in provincial championships for the Special Olympics.

The school has a football team with mixed grade students. In 2022 and 2023, the team made it to the regional semifinals.

In 2019, an 18 year old student went missing. The school honoured him in their graduation ceremony for that year and gave the Ontario Secondary School Diploma to his family. He was later found dead. Foul play was not suspected.

In 2023, a teacher was charged with sexual assault of a student.

• Education in Ontario
• List of secondary schools in Ontario

• Official website
• Simbotics, the robotics team website