Samuel Grosvenor Wood was an American film director and producer who is best known for having directed such Hollywood hits as A Night at the Opera, A Day at the Races, Goodbye, Mr. Chips, The Pride of the Yankees, and For Whom the Bell Tolls and for his uncredited work directing parts of Gone with the Wind. He was also involved in a few acting and writing projects.

A Night at the Opera is a 1935 American comedy film starring the Marx Brothers, and featuring Kitty Carlisle, Allan Jones, Margaret Dumont, Sig Ruman, and Walter Woolf King. It was the first of five films the Marx Brothers made under contract for Metro-Goldwyn-Mayer after their departure from Paramount Pictures, and the first after Zeppo left the act. The film was written by George S. Kaufman and Morrie Ryskind from a story by James Kevin McGuinness, with additional uncredited dialogue by Al Boasberg. The film was directed by Sam Wood.