Dehio is a surname. Notable people with the surname include:
Erhard Arnold Julius Dehio (1855–1940), Baltic German merchant and politician, former mayor of Tallinn (1918) Georg Dehio (1850–1932), Baltic German art historian Ludwig Dehio (1888–1963), German archivist and historian, son of Georg Dehio Karl Gottfried Konstantin Dehio (1851–1927), Baltic German internist and professor of pathology
See also 48415 Dehio, a main-belt asteroid named after Georg Dehio