A glowworm is the glowing larva stage of various insects.

Glowworm may also refer to:

• 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
• HMS Glowworm, three British Navy ships
• Glo Worm, a children's toy
• Gloworm, a house music group active in the 1990s
• "Glow Worm", a song by Skrillex
• "Glowworm", a song by The Apples in Stereo on their album Fun Trick Noisemaker
• Glow-worm, a UK boiler manufacturer and one of the eight brands that form the Vaillant Group
• The Glowworm, a character in the children's book James and the Giant Peach