The Niagara Parks Police Service is a special constabulary maintained by the Niagara Parks Commission in Niagara Falls, Niagara-on-the-Lake and Fort Erie, Ontario, Canada. Established in 1887, the Niagara Parks Police Service has a unique status among Ontario special constabularies in that its members are armed and trained at the Ontario Police College. As special constables, Parks Police officers only have authority on or in relation to property owned by the Niagara Parks Commission, in contrast to municipal or provincial police officers, who have authority province-wide.

Law enforcement in Canada is the responsibility of police services, special constabularies, and civil law enforcement agencies, which are operated by every level of government, some private and Crown corporations, and First Nations. In contrast to the United States or Mexico, and with the exception of the Unité permanente anticorruption in Quebec and the Organized Crime Agency of British Columbia, there are no organizations dedicated exclusively to the investigation of criminal activity in Canada. Criminal investigations are instead conducted by police services, which maintain specialized criminal investigation units in addition to their mandate for emergency response and general community safety.