The École Polytechnique massacre, also known as the Montreal massacre, was an antifeminist mass shooting that occurred on December 6, 1989 at the École Polytechnique de Montréal in Montreal, Quebec. Fourteen women were murdered; another ten women and four men were injured.

Antifeminism, also spelled anti-feminism, is opposition to feminism. In the late 19th century and early 20th century, antifeminists opposed particular policy proposals for women's rights, such as the right to vote, educational opportunities, property rights, and access to birth control. In the mid and late 20th century, antifeminists often opposed the abortion-rights movement.