Otacilius

The gens Otacilius (for men) or Otacilia (for women) was a nomen (see Roman naming conventions) of Ancient Rome. Their status and origins are unknown and they were of consular and senatorial rank. The cognomens for this family were Crassus, Naso and possibly Severianus or Severus.

Various members included:
* Manius Otacilius Crassus, consul 263 BC
* Titus Otacilius Crassus, praetor and brother to the above
* Tiberius Otacilius Crassus, a praetor living in the 3rd century BC
* Lucius Otacilius Pilitus, a rhetorician (see Rhetoric), who opened a school at Rome in 81 BC
* Otacilius Crassus, a military officer of triumvir Pompey
* Gnaeus Otacilius Naso, a little known Roman mentioned in the surviving sources of Cicero
* Otacilius Severus or Severianus, a governor in the 3rd century
* Otacilius Severianus, governor of Lower Moesia between 246-247
* Marcia Otacilia Severa, sister to the above, Roman Empress and wife of Roman Emperor Philip the Arab, who lived in the 3rd century