Thornhill Secondary School

Originally it served as an elementary school, but in 1956 it opened as a full-time high school with 600 students. The TSS library was established in 1960 and renovated in 2007. In 1962, the school increased its classrooms from 30 to 47 and added 32 members to its original faculty of 29.

By 1962, 1090 students were enrolled. A technical and commercial wing was built in 1961. In 1976, the school undertook a major renovation. That same year, the drama program started and the music program expanded. In 1999, an expanded science wing was constructed to accommodate an overflow of students. A new library and school hallway connecting science to the technologies and music was completed in June 2007.

The Thornhill Secondary School TSS senior boys' basketball team has competed at OFSAA numerous times. The school's DECA Chapter has historically sent from one to fifteen delegates to DECA's International Career Development Conferences each year, held in major US cities. The school newspaper the Eye of the Tiger is an award-winning publication[2] with a reach of nearly 2000 staff, students, and community members. Thornhill Debaters have placed first, and in the top 10, at most major university-level tournaments in Ontario and Quebec, and in the National Championships.

Sports teams at Thornhill Secondary School include:

• Badminton
• Baseball
• Basketball
• Soccer
• Ultimate Frisbee
• Volleyball
• Track and Field
• Cross Country
• Girls Field Hockey
• Tennis

Following the school's 50th anniversary in 2004, the Thornhill Secondary School Alumni Association (TSSAA) was established to keep students in touch with each other and with the school and community. The TSSAA holds an annual Half Century Club Luncheon which recognizes students who began at Thornhill fifty years prior. The TSSAA is also active within the school, sponsoring numerous awards for both graduating and non-graduating students.

• Milos Raonic, tennis player[3]
• Barbra Lica, jazz singer-songwriter[4]
• Brian Clark (9/11 attacks survivor)
• Sandra Bussin taught at Thornhill Secondary School, in 1987.
• Michelle Shephard, journalist for the Toronto Star.
• Stefan Nastić, basketball player[5]
• Cameron Bailey, artistic director of the Toronto International Film Festival[6]
• Josh Saltzman, head writer of Inspector Gadget on Netflix
• Dawn Langstroth, Daughter of Anne Murray and singer/songwriter.
• Jon Levine, Songwriter/Producer/Performer The Philosopher Kings, Drake.
• Daniel Dale, former journalist for the Toronto Star, reporter for CNN
• John Goadsby aka Goldy McJohn, was a Canadian keyboard player best known as the original keyboardist for rock group Steppenwolf

• List of high schools in Ontario

• Official Thornhill Secondary School Website
• Thornhill Secondary School Alumni Association Website