Dona Massin (18 February 1917 – 26 May 2001), born Luciana Thomassin, was a choreographer in Hollywood during the 1930s and 1940s. She also worked as a movie extra, appearing in some 100 films. She filled both roles in the 1939 MGM film The Wizard of Oz.
Born in Winnipeg, she moved to Los Angeles with her family at the age of 8. Her family was French-speaking, though she learned English quickly. She first worked at MGM as a 14-year-old dancer. Massin was 21 years old when she worked on the MGM Oz film. She was an assistant choreographer under Bobby Connolly; her primary job was to teach the little people who played the Munchkins a set of simple dance steps and routines.
Massin married and left movies after 1943 to be a parent and homemaker. Late in life, she became active in Oz fandom; she gave interviews and appeared in a documentary about the making of the MGM film.