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Umbo may refer to:

  • Umbo of tympanic membrane, the central, most inverted portion of the ear drum
  • A shield boss
  • Umbo (mycology), at the top of some mushrooms
  • Umbo (bivalve), the (often somewhat protruding) part of a bivalve shell which was formed when the animal was a juvenile
  • The first year's growth of a seed scale on a Pinus cone, showing up as a protuberance at the end of the two-year-old scale
  • Umbo (eye), the tiny depression in the very center of the foveola corresponding to the foveal reflex
  • Otto Umbehr, German photographer known as "Umbo"