Route 20 is a 32.3 km (20.1 mi), two-lane, uncontrolled-access, secondary highway in Prince Edward Island.

The route is located in Prince and Queens counties.

The route begins at its western terminus and heads north to Malpeque, where it turns right.

It crosses the Baltic River, heads east, crosses the county line, and curves south near French River.

It crosses the Southwest River and ends at its eastern terminus.