Arrianus

Arrianus may refer to:


 * Arrianus (bishop), bishop of Ionia, (c. 363–?) and an Anomoean
 * Arrianus (jurist), Roman jurisconsult
 * Arrianus (poet), Greek poet who made a Greek translation in hexameter verse of Virgil's Georgics, possibly conflated with Adrianus (poet)
 * Arrian or Arrianus (c. 86/89–c. after 146/160), Greek historian, public servant, military commander and philosopher of the Roman period
 * Arrianus (historian), historical writer of probably around the 3rd century CE
 * Lucius Annius Arrianus, Roman consul 243 CE
 * Arrianus (astronomer), Greek astronomer