Seaside Park may refer to a number of places:
Municipalities Seaside Park, British Columbia Seaside Park, New Jersey
Parks Seaside Park (Connecticut), Bridgeport, Connecticut, listed on the National Register of Historic Places (NRHP) in Fairfield County, Connecticut Seaside Park (Marblehead, Massachusetts), listed on the NRHP in Essex County, Massachusetts Seaside Park (Ventura) in Ventura, California