Robert Leadam Eddison, OBE (10 June 1908 – 14 December 1991) was an English actor, who is probably most widely remembered in the role of the Grail Knight in Indiana Jones and the Last Crusade. He also played the tragic ferryman in The Storyteller episode "The Luck Child".

Born in Japan to English parents, Edwin Eddison and Hilda Muriel Leadham, he had a twin brother Talbot Leadam Eddison. Through his paternal grandmother, Anna Paulina Tatham of Philadelphia, he was related to the Tatham Brothers Iron pipe manufacturers of Philadelphia. As his paternal great-grandfather Henry Billington Tatham's name suggests, he was a descendant of the Billington family who came to America from England on the Mayflower.