Gwydir Forest, also spelled Gwydyr, is located in Conwy county borough and the Snowdonia National Park in Wales. It takes its name from the ancient Gwydir Estate, established by the John Wynn family of Gwydir Castle, which owned this area.
Natural Resources Wales uses the alternative spelling. Certainly as early as 1536, Leland wrote: "Gwydir lieth two bowshots above the River Conwy. It is a pretty place."