Gwydir may refer to:
Australia Division of Gwydir, electoral division Gwydir by-election, 1989 Gwydir Highway, New South Wales Gwydir River, New South Wales Gwydir Shire, New South Wales Gwydir Wetlands, New South Wales
United Kingdom Gwydir Castle, Conwy, Wales Gwydir Forest, Conwy, Wales Gwydyr House, Whitehall, London Gwydyr Mansions, Hove, East Sussex Gwydir Street, a residential terraced street constructed in 1863 in Cambridge Gwydir Cottage, a Grade II listed property in Sidmouth, Devon
See also Baron Gwydyr, an extinct title in the Peerage of Great Britain