| Thomas A. Blakelock High School | |
| Address: | 1160 Rebecca Street[1] |
| City: | Oakville |
| Province: | Ontario |
| Postcode: | L6L 1Y9 |
| Country: | Canada |
| Schooltype: | High School |
| Motto: | Ad majora natus sum |
| Motto Translation: | Latin: I was born for greater things |
| Founded: | 1957 |
| Schoolboard: | Halton District School Board |
| Superintendent: | Eleanor McIntosh |
| Trustee: | Carole Baxter |
| Number: | 947539 |
| Principal: | Paul Dawson[2] |
| Grades Label: | Grades |
| Grades: | 9–12 |
| Enrolment: | 994 |
| Enrolment As Of: | 2017-2018 |
| Language: | English, French Immersion |
| Colours: | Green, Black & White |
| Mascot: | Tabbie |
| Team Name: | Tigers |
| Feeder Schools: | Brookdale, Eastview, Oakwood, Ecole Pine Grove and WH Morden public schools[3] |
T.A. Blakelock High School is the second oldest high school in the town of Oakville, Ontario, and has the oldest high school building in Oakville still in use as a school. The school was built in 1957. There are 1,200 students currently enrolled at T.A. Blakelock. The school is named after Thomas Aston Blakelock.
The school's athletic teams were originally known as the Tabbies, after the acronym TAB. They are now called the Tigers.
Blakelock is the only public high school in southwest Oakville, after the closure of Queen Elizabeth High School and the transfer of Gordon E. Perdue High School to the Catholic Board in 1990.
The current principal is Paul Dawson.
Blakelock is known for having an excellent music program. In 2013, its Senior Wind Ensemble and Grade 12 Percussion Ensemble both won Gold at MusicFest's Canadian National Music Festival.