Captain Scarlet is the fictional main character in Gerry Anderson's British Supermarionation science-fiction television series Captain Scarlet and the Mysterons and its computer-animated remake, Gerry Anderson's New Captain Scarlet.

The likeness of the original Scarlet has variously been attributed to the actors Cary Grant and Roger Moore as well as to the character's voice actor, Francis Matthews. It is widely acknowledged that the voice was an imitation by Matthews of the English-American, Mid-Atlantic inflections of Cary Grant.

Well-trusted by the commander-in-chief of Spectrum, Colonel White, Captain Scarlet is the primary agent of the organisation and is assigned the most dangerous and crucial missions. He is a close friend of Captain Blue, who is his "field partner" and thus with whom he undertakes the majority of his missions, although he is on friendly terms with all other Spectrum agents. A close relationship with Destiny Angel is also hinted at several times in the series.

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