Ridley Park is a borough in Delaware County, Pennsylvania, United States. The population was 7,002 at the 2010 census.
The Lenape inhabited the Delaware River region several centuries before the arrival of European explorers and traders. The Okehocking Tribe of the Lenni Lenape Nation established small permanent villages along the river and its main tributaries. Land adjacent to Stoney Creek in Ridley Township has been identified as a Native American town site. The borough is named after a place in Cheshire, England. John Morton, signer of the American Declaration of Independence, was born and raised in a log cabin adjacent to East Ridley Avenue. He later replaced the cabin with a brick house and began farming 133 acres (0.54 km2) in the Ridley Park area.Ridley Park was founded by Isaac Hinckley in 1871. He was the President of the Philadelphia, Wilmington & Baltimore Railroad.