Route 158, officially named Harper Road, and sometimes referred to sectionally as Leoville Road (see below), is a 2-lane collector highway in western Prince County, Prince Edward Island, Canada.

The highway runs from Route 156 (Palmer Road) to Route 2 (Tignish), the Veteran's Memorial Highway, passing through the communities of Tignish, Harper, Leoville, and Palmer Road.

The highway is grossly considered as part of the Tignish district, though some may consider southern portions of the highway to be part of the St. Louis–Miminegash region.

Though the entire highway runs straight from Route 156 (Palmer Road) to Route 2 (Western Road) without any interruptions, the highway is sometimes considered by local residents to be two "separate roads" because of traditional naming and zoning.

Civic addresses south of there (house numbers 1101–1550) are part of Miminegash Fire Department.