Oakville Trafalgar High School (OTHS, often referred to as OT) is a secondary school located in Oakville, Ontario, Canada. The school receives most of its students from nearby feeder schools, including Maple Grove Public School, École E.J. James Public School, St Luke's Catholic Elementary School, St. Vincent's Catholic Elementary School and James W. Hill Public School, as well as many students coming from private schools.

The school is also host to a YMCA child care centre for children aged 18 months to five years.