Hilarianus

Hilarianus or Hilarian may refer to:

People

 * Publius Aelius Hilarianus (2nd century), Roman politician, probably the governor in the Passion of Saints Perpetua and Felicity
 * Furius Hilarianus (2nd century), Roman military commander
 * Mecilius Hilarianus (fl. 316–354), prefect of Rome and praetorian prefect of Italy
 * Decimus Hilarianus Hilarius (fl. 377–396), prefect of Rome and praetorian prefect of Italy
 * Decimius Hilarianus Hesperius (4th century), Roman politician
 * Caelius Hilarianus (fl. 377), Roman senator and priest
 * Hilarianus (magister officiorum) (fl. 470)
 * Quintus Julius Hilarianus (fl. 397), Roman historian and millenarian writer
 * Hilarian of Espalion (d. 793), Catholic priest purportedly martyred by the Saracens

Other

 * Hilarianus (genus), genus of insects