Gwalchmai (disambiguation)
Gwalchmai or Gwalchmei is a figure in Welsh Arthurian legend known in English as Gawain. Gwalchmai may also refer to:

 Gwalchmai, Anglesey, a village in Anglesey, north Wales
 Gwalchmai ap Meilyr (12th century), Welsh court poet
 C.P.D. Gwalchmai, an association football team from Gwalchmai, Anglesey