Umbo may refer to:
Anatomy Umbo (eye), tiny depression in the center of the foveola corresponding to the foveal reflex Umbo of tympanic membrane, the central, most inverted portion of the eardrum
Flora and fauna Umbo (bivalve), part of a bivalve shell which was formed when the animal was a juvenile Umbo (conifer cone), the first year's growth of a seed scale on a conifer cone, showing up as a protuberance at the end of the two-year-old scale Umbo (mycology), at the top of some mushrooms
Other Otto Umbehr (1902–1980), a German photographer known as "Umbo" A shield boss, a round, convex, or conical piece of material at the center of a shield