Peadar Lamb (24 December 1929 – 1 September 2017) was an Irish actor. He was known for his roles in numerous Irish-language stage productions, including playing King Fin Varra in the television series Mystic Knights of Tir Na Nog, and voicing Grandpa Piggley Winks on the children's television series Jakers! The Adventures of Piggley Winks.

Lamb grew up in An Cheathrú Rua, Carraroe. His father, Charles Lamb, was a well-known painter. Peadar Lamb trained at the Abbey Theatre and first appeared on stage in 1954.

Lamb had a theatrical career lasting over 60 years. Over the course of this time, he played diverse characters and appeared in a number of plays by famous playwrights including Brendan Behan, Dion Boucicault and Seán O'Casey:

Other stage performances include a role as Curly in John Murphy's The Country Boy and as the blind man in W. B. Yeats' On Baile's Strand. Lamb toured America and Canada in 1990 with John Millington Synge's The Playboy of the Western World. In June 2002, Peadar Lamb and his wife Geraldine Plunkett played leading roles in a production of Tony Guerin's play Hummin', performed by the Waterford-based Red Kettle Company.

Lamb appeared on many series broadcasts on RTÉ One, including television soap operas Fair City and Ros na Rún. He appeared in a 1998 episode of the sitcom Father Ted and played Mr. Hasson in the British drama film The Railway Station Man, opposite Donald Sutherland and Julie Christie. He also played fairy King Fin Varra in the television series Mystic Knights of Tir Na Nog, loosely based on Irish mythology and voiced Old Piggley Winks on the children's television series Jakers! The Adventures of Piggley Winks.

Lamb qualified as a primary school teacher before becoming an actor full time and later taught young actors at his alma mater, Abbey School of Acting.

Lamb was married to actress Geraldine Plunkett from 1965. They had seven children.

Lamb died in his sleep at his home in Glenageary, Ireland, on 1 September 2017, at the age of 87.