Coplay is a borough in Lehigh County, Pennsylvania, United States.

Coplay is situated along the Lehigh River, approximately 5 miles (8.0 km) north of Allentown.

Coplay was part of the 400 acres (1.6 km2) of land John Jacob Schreiber bought from the William Penn's heirs in 1740.

Lehigh Valley was then changed to Coplay, derived from "Kolapechka", the son of the Indian chief Paxanosa, who lived at the head of the creek near Schnecksville.

Coplay gradually changed from a farming area into an industrial community, starting with the founding of the Thomas Iron Company, which attracted laborers and built homes for them.

The Pennsylvania Dutch and Germans were initially drawn to the area for its agricultural promise.

Then, in the early 1900s, the Cement Mills attracted immigrants from Austria, Hungary, Czechoslovakia, Poland, and Ukraine.

As of 2007, there were 11.18 miles (17.99 km) of public roads in Coplay, all of which were maintained by the borough.