Merwin or Merwyn may refer to:
People Merwin (name), or Merwyn, a surname and masculine given name W.S. Merwin (1927–2019), American poet.
Places United States Merwin Dam, a hydroelectric dam in the state of Washington Lake Merwin, the reservoir formed by the dam Merwin, Missouri, a village Merwin House, Stockbridge, Massachusetts, currently a museum
See also Mervin (disambiguation) Mervyn, related name