Peggy Seeger (born June 17, 1935, New York City)is an American folk singer who also achieved renown in Britain, where she lived for more than 30 years, as the wife of songwriter and activist Ewan MacColl.

Seeger's father was Charles Seeger (1886–1979), an important folklorist and musicologist; her mother was Seeger's second wife, Ruth Porter Crawford (1901–1953), a modernist composer who was one of the first women to receive a Guggenheim Fellowship.

One of her brothers is Mike Seeger, and the well-known songwriter Pete Seeger is her half-brother.

One of Peggy Seeger's first recordings was "American Folk Songs for Children" (1955), considered one of her most enduring, and probably the best-selling, collection of children's songs ever recorded.

Together with MacColl, Seeger joined The Critics Group, performing satirical songs in a mixture of theatre, comedy and song. Seeger and MacColl recorded as a duo and as solo artists; MacColl wrote "The First Time Ever I Saw Your Face" in Seeger's honor.

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