Thunder Rock is a 1939 play by Robert Ardrey. The initial Broadway production, put on by the Group Theater and directed by Elia Kazan, closed after a short run, but the play was far more successful in wartime London. Thunder Rock became a symbol of British resistance and was the most notable play of World War II. It was first produced in a little-known theater in South Kensington but was transferred, with secret funding from Her Majesty's Treasury, to the Globe Theatre in London's West End.