William Desmond (born William Mannion; January 23, 1878 – November 3, 1949) was an American actor. He appeared in more than 200 films between 1915 and 1948. He was nicknamed "The King of the Silent Serials." Born William Mannion in Salamanca, New York on January 23 1878, he was raised in New York City. He later changed his surname to a stage name. He started out in vaudeville and the legitimate stage before making his film debut. In 1919, he married his co-star Mary McIvor, with whom he had two daughters. He portrayed a globetrotting hero, Phineas Fogg the 3rd, in a now lost film serial from the twenties. With the coming of sound he gravitated to older, supporting roles. On November 3, 1949, Desmond died at age 71 of a heart attack in Los Angeles, California. His cremated remains are stored in the vault at the Chapel of the Pines Crematory, Los Angeles.

Selected filmography