Greg Valentine or "The Blue Knight", American professional wrestler
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VMM-365 or the "Blue Knights", a United States Marine Corps tiltrotor squadron
NYPD Blue | Toronto Blue Jays | Knight Bachelor | Blue Peter | knight | Knight | Blue | Blue Ridge Mountains | Gladys Knight | Blue Öyster Cult | Blue Note Records | Blue Heelers | The Dark Knight Rises | Pokémon Red and Blue | Knight's Cross of the Iron Cross | Winnipeg Blue Bombers | Blue Nile | Suge Knight | Bob Knight | Knight's Cross | Shirley Knight | Blue's Clues | ''Pokémon Red'' and ''Blue'' | Gladys Knight & the Pips | Blue Man Group | Vida Blue | The Blue Danube | Rhapsody in Blue | blue plaque | Blue Mountain State |
He also acted in popular television series of the '70's, such as Cannon, starring William Conrad, The Blue Knight, starring George Kennedy and To Rome with Love, starring John Forsythe.