Captain Blue may refer to:

• Captain Blue (Captain Scarlet), a character from the TV series Captain Scarlet and the Mysterons and Gerry Anderson's New Captain Scarlet
• Captain Blue (Viewtiful Joe), a character from the video game Viewtiful Joe

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• Sylvia (disco singer)
• Sylvia Dryhurst
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• Sylvia engdahl
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• Sylvia, Kansas
• Sylvia Kristel
• Sylvia, KS