- Father of the actor Brian Keith.
- He married the highly regarded and successful Theater Guild actress Peg Entwistle. They married on April 18, 1927 while she was the female lead in the Broadway hit, "Tommy". The marriage was a civil affair and took place in the New York City Municipal Building in Manhattan. Actor Frank Allworth and Keith's mother, Mary D. Robinson, were the witnesses. Entwistle later achieved her greatest fame posthumously in 1932, when she committed suicide by jumping to her death from the top of the letter "H" in the famous Hollywood Sign.
- Originated the role of "Doc" in the Broadway production of "Mr. Roberts." The film version featured William Powell in the role. Later starred in a remake of My Man Godfrey (1936), which was originally featured Powell as the title character.
- Twice played a policeman pitted against a bad boy played by Marlon Brando: in The Wild One (1953) and Guys and Dolls (1955).
- Played Dorothy Malone's character's father twice on film: in Young at Heart (1954) and Written on the Wind (1956).
- Robert Keith is often best remembered today for his final acting role on television in an episode of " The Twilight Zone " with the title " The Masks "which first aired on March 20, 1964. It is one of the most popular episodes when in reruns.
- Ex-son-in-law of Robert Entwistle.
- His wife, Dorothy Tierney, was the daughter of stage actors John T. Tierney and Gertrude Millington.
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