Robert Ballagh (born 1943) is an Irish artist. He was born in Dublin.
Ballagh represented Ireland at the 1969 Paris Biennale. Among the theatre sets he has designed are sets for Riverdance, Samuel Beckett's Endgame (1991) and Oscar Wilde's Salome (1998). He has also designed over 70 Irish postage stamps and the last series of Irish banknotes before the introduction of the Euro. He is a member of Aosdána.