Cal McCrystal is an Irish theatre director and actor. He is the brother of the journalist Damien McCrystal and the son of the journalist and writer Cal McCrystal. Following an early career acting in theatre, television, radio plays and commercials, McCrystal became a director specialising in comedy. His notable credits include Physical Comedy Director on the National Theatre's One Man, Two Guvnors starring James Corden and physical comedy consultant on Paddington and Paddington 2. In 2018, he directed a new production of Gilbert and Sullivan's Iolanthe for the English National Opera.