King's Highway 38, commonly referred to as Highway 38, was a provincially maintained highway in the Canadian province of Ontario. The road connects highways 2 and 401 in Kingston with Highway 7 west of Perth. Highway 38 was designated in 1934 and remained relatively unchanged throughout its existence aside from some minor diversions. At the beginning of 1998, the entire highway was transferred to the City of Kingston and the municipalities of Frontenac County. It is now designated as County Road 38 throughout its length.