Trafalgar Castle School in Whitby, Ontario is an internationally known, independent day and boarding school for girls and young women in grades 4 through 12. Boarding at the school begins in grade 7. Founded in 1874 as "Ontario Ladies' College", Trafalgar Castle School is one of the oldest independent schools in Canada and the second-oldest girls' school in Ontario.

Whitby is a town in Durham Region. Whitby is located in Southern Ontario east of Ajax and west of Oshawa, on the north shore of Lake Ontario and is home to the headquarters of Durham Region. It had a population of 138,501 at the 2021 census. It is approximately 45 km (28 mi) east of Toronto, and it is known as a commuter suburb in the Durham Region, east of the Greater Toronto Area. While the southern portion of Whitby is predominantly urban and an economic hub, the northern part of the municipality is more rural and includes the communities of Ashburn, Brooklin, Myrtle, Myrtle Station, and Macedonian Village.