Ilarion (Bulgarian: Иларион, Serbian: Иларион, Russian: Иларион, Ukrainian: Іларіон) is a variant of the Greek given name Hilarion, found in Slavic and Romanian languages. It may refer to:
Hilarion of Kiev or Ilarion, Metropolitan of Kiev
Ilarion Buiuc (1891–1918), Bessarabian politician
Ilarion Roganović (1828–1882), Bishop of Cetinje and Metropolitan of Montenegro and the Highlands
Ilarion Ciobanu (1931–2008)
Ilarion Felea (1903-1961)
Ilarion Ionescu-Galați (born 1937), Romanian violinist and orchestra conductor
Ilarion Makariopolski (1812–1875), Bulgarian
Ilarion Ruvarac (1832–1905), Serbian historian and Orthodox priest,
Ilarion Ohienko, Metropolitan Ilarion
Ilarion Dragostinov (1852–1876), Bulgarian
