Eileen (Ellen) Costello (Irish: Eibhlín Bean Ui Coisdealbha) (née Drury; died 4 March 1962) was an Irish politician, writer, teacher and folklorist. She was elected to the Irish Free StateSeanad Éireann as an independent member in December 1922. She was one of four women elected or appointed to the first Seanad in 1922. She was re-elected for 3 years in 1931 but lost her seat in the 1934 Seanad election.
In 1919, Costello published a compilation of traditional folk-songs from Galway and Mayo, titled Amhráin Muighe Seola: Traditional folk-songs from Galway and Mayo.