The Binder Twine Festival, or usually Binder Twine, was an annual festival held the first Saturday after Labour Day in Kleinburg, Ontario, Canada. It was one of the most popular festivals in southern Ontario, and marked the beginning of the harvest fair season in the Greater Toronto Area. In April 2020, the committee that organized the festival announced that as a result of increased costs and decreasing number of volunteers, it would discontinue the festival. There was a fee for admission except for those wearing pioneer period costumes, who were admitted for free.