Kingston Penitentiary (known locally as KP and Kingston Pen, and sometimes jokingly Disneyland) is a maximum security prison located in Kingston, Ontario between King Street West and Lake Ontario.

Originally constructed in 1833–34, and officially opened on June 1, 1835 as the "Provincial Penitentiary of the Province of Upper Canada," it is one of the oldest prisons in continuous use in the world. It is well known and often referred as Alcatraz North. Its western wall is the eastern wall of the Portsmouth Olympic Harbour, which hosted the sailing events for the 1976 Summer Olympics.

Immediately across the road is the Kingston Prison for Women (now used for office space), officially opened on January 24, 1934 to take female prisoners who had originally been housed in segregated quarters in the main facility. The penitentiary's imposing grey limestone walls give it the appearance of a massive 19th-century fortress.