| Ystumllyn | |
|---|---|
 Ystumllyn in 1794 by John Ingleby | |
| Location | Criccieth, Gwynedd, Wales |
| Coordinates | 52°55′33.53″N 4°12′18.53″W / 52.9259806°N 4.2051472°W |
| Built | late-16th-century |
| Architectural style(s) | Vernacular |
Listed Building – Grade II* | |
| Designated | 12 December 1994 |
| Reference no. | 4291 |
  Location of Ystumllyn in Gwynedd  Ystumllyn (the United Kingdom) | |
Ystumllyn is a Grade II* listed house in Criccieth, Wales. Founded in the late-16th-century, and significantly expanded in the early-18th-century, it is remarkable as an "important example" of the vernacular architecture of both periods.