Russell Irving "Russ" Tamblyn (born December 30, 1934) is an American film and television actor, who is arguably best known for his performance in the 1961 movie musical West Side Story as Riff, the leader of the Jets gang.

Tamblyn was born in Los Angeles, California, the son of actors Sally Triplett and Eddie Tamblyn. He is the older brother of Larry Tamblyn, organist for the 1960s band The Standells.

Discovered at the age of ten by actor Lloyd Bridges after acting in a play, Tamblyn's first film appearance was a small non-speaking role in 1948's The Boy With Green Hair. He also appeared on The Ed Sullivan Show as a child. He portrayed the young Saul in Cecil B. DeMille's 1949 version of Samson and Delilah. He played the younger version of John Dall's character in the 1950 film noir Gun Crazy. Later the same year, he had a minor role as Spencer Tracy's son and Elizabeth Taylor's younger brother in Father of the Bride, as well as in the following year's sequel, Father's Little Dividend, both directed by Vincente Minnelli. He was also a young soldier in boot camp in 1953's Take The High Ground. His training as a champion gymnast in high school and abilities as an acrobat prepared him for his breakout role as Gideon, the youngest brother, in 1954's Seven Brides for Seven Brothers.