Adhemar is both a given name and a surname.[1] Notable people with the name include:
- Adhemar of Salerno (died 861), prince
- Adhemar of Capua (died after 1000), prince
- Adhémar de Chabannes (988–1034), French monk and historian
- Adhemar of Le Puy (died 1098), bishop
- Adhémar Jori/Jory (1375), lord of Domeyrat près Carlat,
- François Adhémar de Monteil (1603–1689), Archbishop of Arles
- François Adhémar de Monteil, Comte de Grignan (1632–1714), French aristocrat
- Adhémar Jean Claude Barré de Saint-Venant (1797–1886), mechanician
- Adhémar d'Alès [it] (1861–1938), French theologian and Jesuit
- Louis-Alfred-Adhémar Rivet (1873–1951), politician
- Adhémar Raynault (1891–1984), politician
- Adhemar (footballer, born 1896), Adhemar dos Santos, Brazilian football midfielder
- Adhemar Pimenta (1896–1970), sports manager
- Adhemar de Chaunac (born 1896, fl. 1961), vintner
- Adhemar de Barros (1901–1969), mayor of São Paulo and Governor of São Paulo
- Adhemar da Silva (1927–2001), athlete
- Adhemar Bultheel (born 1948), Belgian mathematician
- Adhemar (footballer, born 1972), Adhemar Ferreira de Camargo Neto, Brazilian football forward