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.

Murphy's War is an Eastmancolor 1971 Panavision war film starring Peter O'Toole and Siân Phillips. It was directed by Peter Yates based on the 1969 novel by Max Catto. The film's cinematographer was Douglas Slocombe.