Wind Gap is a borough in Northampton County, Pennsylvania, United States. Wind Gap is located in the Lehigh Valley region of the state. It is part of Pennsylvania's Slate Belt. According to the United States Census Bureau, the borough has a total area of 1.4 square miles (3.6 km2), of which 0.73% is water. Wind Gap is located 19 miles (31 km) north of Bethlehem and 20 miles (32 km) northwest of Easton at the southern base of Blue Mountain.