The National Board of Review Award for Best Supporting Actor is one of the annual film awards given by the National Board of Review of Motion Pictures.

Sabrina is a 1954 American romantic comedy-drama film directed by Billy Wilder, from a screenplay he co-wrote with Samuel A. Taylor and Ernest Lehman, based on Taylor's 1953 play Sabrina Fair. The picture stars Humphrey Bogart, Audrey Hepburn, and William Holden. This was Wilder's last film released by Paramount Pictures, ending a 12-year business relationship between him and the company.