A glowworm is the glowing larva stage of various insects. It may also refer to:

• Glo Worm, a children's toy
• {{HMS|Glowworm}}, three British Navy ships
• Glowworm (astronomy), the luminous trail of a tiny meteor
• Glowworm (comics), two unrelated Marvel Comics characters
• Glowworm Records, a subsidiary of Epic Records
• "The Glow-Worm", a song written by Paul Lincke
• "Glow Worm", a song by Skrillex
• "Glowworm", a song by The Apples in Stereo on their album Fun Trick Noisemaker
• The Glowworm, a character in the children's book James and the Giant Peach
• Glow-worm, a UK boiler manufacturer and one of the eight brands that form the Vaillant Group.

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