Frank Dwight Alexander (May 25, 1879 – September 8, 1937) was an American silent film comedian and actor.

He is best known to contemporary audiences for portraying a villainous interpretation of Uncle Henry, eventually proclaimed "Prince of Whales" upon reaching the Emerald City in Semon's Wizard of Oz.

He was also part of the comedy team called "A Ton Of Fun" with two other large actors, Kewpie Ross and Hilliard Karr.

Richard M. Roberts's article in Classic Images[citation needed] listed the top ten ingredients of a Larry Semon film, which began with these four: He was proclaimed at the time as one of the three fattest actors ever to appear on the screen, with Roscoe "Fatty" Arbuckle as one of the others.

His ashes are unmarked but lie in the Garden of Beginnings at Hollywood Forever Cemetery near Los Angeles.