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Caustic most commonly refers to:

• Causticity, the property of being able to corrode organic tissue
  • Sodium hydroxide, sometimes called caustic soda
  • Potassium hydroxide, sometimes called caustic potash
  • Calcium oxide, sometimes called caustic lime

Caustic may also refer to:

• Caustic (band), an American industrial/powernoise band
• Caustic (mathematics), the envelope of rays reflected or refracted by a manifold
• Caustic (optics), optic phenomenon due to light rays reflecting/refracting through curved surfaces/objects
• Caustic Graphics, a graphics technology developer, part of Imagination Technologies
• Caustic Window, an alias of Aphex Twin (electronic musician Richard D. James)
• A playable character in the battle royale game Apex Legends