East Harbor is the name of a tidal estuary in Truro, Massachusetts that was formerly a harbor until it was cut off from Cape Cod Bay. In 2002, the National Park Service received permission to open up the tidal locks between the two bodies of water to improve the quality of water in the harbor. In June 2008, it was renamed back to its original name from Pilgrim Lake, a name which it held for over one hundred years.
- "East Harbor gets its name back". Wicked Local Provincetown. 20 June 2008. Retrieved 13 March 2014.