Pennsylvania Route 38 is a 40.2-mile-long (64.7 km) state highway located in northwest Pennsylvania. The southern terminus is at U.S. Route 422 and PA 68 northeast of downtown Butler. The northern terminus is at US 322 in Rockland Township.

Eau Claire is a borough in Butler County, Pennsylvania, United States. The population was 316 at the 2010 census. The name means "Clear Water" in French, and is pronounced as the French pronunciation.