Rew is a census-designated place (CDP) in Foster Township, McKean County in the U.S. state of Pennsylvania.

The community is almost halfway between Bradford and the borough and county seat of Smethport.

A notable attraction in Rew is the Bradford Speedway, location of a 1958 NASCAR race won by Junior Johnson.

Rew is located at the summit of a steep hill, where Pennsylvania Routes 46 and 646 intersect.

It is located near the triple boundary of Foster, Otto and Keating Townships.