Blanche Sewell (b. October 27, 1898, Oklahoma - d. February 2, 1949, Burbank, California) was an American film editor.
She had hoped to work as an actress in Hollywood, but became a negative cutter and then an editor. She was film editor on several notable MGM films, including The Wizard of Oz, though she did not live to see the film's spectacular success as a television perennial. She died at age 50. She had a son, Barton F. Sewell II, who died in January 1953.