How Green Was My Valley is a 1939 novel by Richard Llewellyn, narrated by Huw, the main character, about his Welsh family and the mining community in which they live. The author had claimed that he based the book on his own personal experiences but this was found to be untrue after his death; Llewellyn was English-born and spent little time in Wales, though he was of Welsh descent. Llewellyn gathered material for the novel from conversations with local mining families in Gilfach Goch.