John Macmillan is a British actor. Known for House of the Dragon (2022), The Nevers (2021) and King Lear (2018).

THEATRE includes The Lady from the Sea at The Bridge; Phaedra at the National Theatre; The Lover / The Collection in the West End; Killer at Shoreditch Town Hall; Yerma (also at Park Avenue Armory, New York), The Member of the Wedding and In the Red and Brown Water at the Young Vic; The Homecoming at Trafalgar Studios; Children's Children and The Last Days of Judas Iscariot at the Almeida; Piranha Heights at Soho; Cymbeline for Cheek by Jowl (world tour); Macbeth at the Royal Exchange Manchester; and Hamlet at the Donmar Warehouse and on Broadway (for the last two he was nominated for the Ian Charleson Award). TELEVISION includes Surface, One Day, The Cleaner, The Burning Girls, The Great, Ghosts, Extraordinary, House of the Dragon, The Nevers, Famalam, King Lear, Hang Ups, Back, Kiss Me First, Ordinary Lies, The Windsors, Chewing Gum, Hoff the Record, Critical, and Silk. FILM includes The Woman in Cabin 10, The Scurry, Jay Kelly, The People We Hate at the Wedding, Maleficent, The Dark Knight Rises, and Hanna.