Secondary Highway 535, commonly referred to as Highway 535, is a provincially maintained secondary highway in the Canadian province of Ontario. Passing through the municipalities of Markstay-Warren, St. Charles and French River, the highway extends 48.7 kilometres (30.3 mi), generally south to north, from a junction with Highway 64 in Noelville to Riviere Veuve, intersecting Highway 17 in the village of Hagar along the way.