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