The main cast of the 1941 film "How Green Was My Valley" includes:

• Roddy McDowall as Huw Morgan (the youngest child and narrator)
• Walter Pidgeon as Mr. Merddyn Gruffydd (village pastor)
• Maureen O'Hara as Angharad Morgan (Huw's older sister)
• Donald Crisp as Gwilym Morgan (Huw’s father)
• Sara Allgood as Mrs. Beth Morgan (Huw’s mother)
• Anna Lee as Bronwen (Huw’s sister-in-law)
• Patric Knowles as Ivor Morgan (eldest brother)
• John Loder as Ianto Morgan (second eldest brother)
• Barry Fitzgerald as Cyfartha (boxing manager)
• Rhys Williams as Dai Bando (boxer)
• Morton Lowry as Mr. Jonas (schoolmaster)
• Arthur Shields as Mr. Parry (deacon)

Other supporting roles include several members of the Morgan family and villagers portrayed by various actors.