The Toronto District School Board has been asked to ban To Kill A Mockingbird, the Pulitzer-prize winning novel by Harper Lee.
A parent of a student at Malvern Collegiate made the request.
The book was published in 1960. The main plot involves a white lawyer defending a black man accused of rape in a fictional Alabama town.
Racial injustice is a major theme in the novel and racial epithets are used in the text.
Earlier this year, the book was taken off a course reading list in Brampton.
The Freedom to Read organization, which monitors censorship issues in Canada, found that similar requests have been made in Nova Scotia, New Brunswick and Hamilton.
According to the American Library Association, To Kill A Mockingbird is one of the most-challenged books that is also widely considered one of the top novels of the 20th century.