Malcolm McGregor was an American actor of the silent era. McGregor appeared in more than 50 films between 1922 and 1936. He was born in Newark, New Jersey and died in Hollywood, California.

All the Brothers Were Valiant is a 1923 American silent sea adventure and romantic drama film starring Lon Chaney. The film was produced and distributed by Metro Pictures corporation and directed by Irvin Willat. The cast also features Malcolm McGregor, Billie Dove and Robert McKim. The screenplay was written by Julien Josephson, based on the eponymous novel by Ben Ames Williams. The film was also known as Cold Courage.