Seaside Park is a coastal park located in Marblehead, Massachusetts. It is, at a little over 14 acres (5.7 ha), the largest of Marblehead's four public parks, and includes an early 20th century grandstand overlooking the baseball field. At its eastern edge, it provides fine views of Marblehead Harbor and Marblehead Neck. The park was listed on the National Register of Historic Places on June 8, 2011.