St. Martin's Church is an Episcopal church founded in 1699 in Marcus Hook, Pennsylvania, United States. It is located at 22 Church Street, only 500 feet from the Delaware River. It is one of the earliest and last riverfront churches in Pennsylvania. The cemetery at St. Martin's Church contains a memorial commemorating war veterans from the Revolutionary War, the War of 1812, the Mexican–American War, the American Civil War, and the Spanish–American War who are buried in the cemetery.

Marcus Hook is a borough in Delaware County, Pennsylvania, United States. The population was 2,397 at the 2010 census. The current mayor is Gene Taylor. The borough calls itself "The Cornerstone of Pennsylvania". The 2005 film One Last Thing... was set and partially filmed in Marcus Hook.