Princess Street is a major arterial road in Kingston, Ontario, Canada. As the main retail street of downtown Kingston, it is lined by many historic limestone buildings in the city's downtown core.
Princess Street begins at Kingston's current western city limits in Westbrook (continuing from Main Street, Odessa) and ends at the downtown waterfront east of Ontario Street. Eastbound traffic is then carried by Ontario Street across the Lasalle Causeway to Barriefield. All of Princess Street and most of Ontario Street formed part of the Provincial Highway (formerly Highway 2), the main highway from Windsor/Toronto to Montréal until the Kingston Bypass segment of Highway 401 was opened in 1958. In the outlying western sections of the city, the road was still simply Highway 2, with the Princess Street name gradually adopted as the urban area expanded west.