Ontario Highway 37

Highway 37
Highway 37 highlighted in red
Route information
Maintained by the Ministry of Transportation of Ontario
Length	44.2 km[2] (27.5 mi)
Existed	January 6, 1932[1]–present
Major junctions
South end	Highway 401 in Belleville
North end	Highway 7 in Actinolite
Location
Country	Canada
Province	Ontario
Highway system
Ontario provincial highways Current Former 400-series
← Highway 35 → Highway 40
Former provincial highways ←  Highway 36 Highway 38  →

King's Highway 37, commonly referred to as Highway 37, is a provincially maintained highway in the Canadian province of Ontario. It begins at Highway 401 in Belleville and travels 44.2 km (27.5 mi) north to Highway 7 in Actinolite. The route once continued south through Belleville to Highway 62, but was truncated in 1998. Prior to the re-routing, Highway 37 was 47.2 km (29.3 mi) long.

Highway 37 was established in 1932 to provide one of several connections with the extension of Highway 7 between Peterborough and Ottawa that opened that year. Aside from several diversions around communities along its length, the route of Highway 37 has remained relatively unchanged since then. The only major settlement on the route between its termini is the village of Tweed, located in the Municipality of Tweed (the latter henceforth referred to as Tweed in this article).