Publius Valerius Comazon Eutychianus (died 222) was a Roman general and ally of emperor Elagabalus. Upon the accession of Macrinus as emperor in 217, Eutychianus orchestrated a revolt among the Third Legion to help secure the throne for Elagabalus, who was tied to the Severan dynasty. Eutychianus was later rewarded with various important offices in the Empire, including prefect of Elagabalus' bodyguard, known as the Praetorian Guard, consul in 220 and an unprecedented three terms as City prefect in 220, 221 and 222.