Fox Run is a neighborhood in Cranberry Township, Butler County, Pennsylvania, United States. It is among the Township's earliest housing developments, including 320 homes built on a 131-acre site in the late 1960s. It was formerly a census-designated place (CDP), but that designation was removed as of the U.S. Census TIGER 2013 geospatial/map data update after Cranberry Township officials pointed out that creators of Internet mapping websites had misinterpreted the name of the CDP as the name of the parent township.