Harry Agar Lyons (1 April 1878 – 1944) was an Irish-born British actor. He is best known for playing Fu Manchu in a series of fifteen silent films called The Mystery of Dr. Fu Manchu all filmed in 1923, followed by a 1924 series of eight additional Fu Manchu films under the title The Further Mysteries of Dr. Fu Manchu. Lyons starred in the title role of all 23 movies (which ran about 20 minutes each in length), all of which featured Fu's ongoing battle with his two British nemeses, Sir Nayland Smith (played by Fred Paul) and Dr. Petrie. Both series were produced by Oswald Stoll (see List of Stoll Pictures films), who had earlier produced a 1920 film version of Sax Rohmer's 1915 "Yellow Peril" novel, The Yellow Claw.