Coraopolis () is a borough in Allegheny County, Pennsylvania, United States. The population was 5,677 at the 2010 census. In 1940 the population peaked at 11,086. It is a small community located to the west of Pittsburgh, along the Ohio River and to the east of the Pittsburgh International Airport. The borough is noted for its steep topography, numerous brick streets and many large, old homes. The American Bridge Company is headquartered in Coraopolis.
On April 3, 1769, Andrew Montour, an Indian interpreter who had provided service to English settlers during the French and Indian War, was granted a land patent for approximately 350 acres (1.4 km2) of what would later become the borough of Coraopolis and Neville Island. However, there is no evidence that Montour ever lived on this tract. The first permanent white settler in Coraopolis was Capt. Robert Vance, who settled in the vicinity of Montour's tract around 1773, just prior to the beginning of the American Revolution. Vance, a Virginian, had been a member of the regiment commanded by George Washington at the Braddock expedition during the French and Indian War.