Under Milk Wood is a 1972 British drama film directed by Andrew Sinclair and based on the 1954 radio play Under Milk Wood by the Welsh writer Dylan Thomas, commissioned by the BBC and later adapted for the stage. It featured performances by Richard Burton, Elizabeth Taylor, Siân Phillips, David Jason, Glynis Johns, Victor Spinetti, Ruth Madoc, Angharad Rees, Ann Beach, Vivien Merchant, and Peter O'Toole as the residents of the fictional Welsh fishing village of Llareggub.

Dame Jane Elizabeth Ailwên Phillips, known professionally as Siân Phillips, is a British actress from Gwaun-Cae-Gurwen, Glamorgan, Wales. Her early career consisted primarily of stage roles, including the title roles in Ibsen's Hedda Gabler and George Bernard Shaw's Saint Joan. In the 1960s, she started taking on more roles in television and film. She is particularly known for her performance as Livia in the 1976 BBC television series I, Claudius, for which she was awarded a BAFTA and a Royal Television Society award.