Marcus Aurelius (/ɑːˈriːliəs/ or /ɑːˈriːljəs/; Latin: Marcus Aurelius Antoninus Augustus; 26 April 121 – 17 March 180) was Roman emperor from 161 to 180 and a Stoic philosopher. He was the last of the rulers known as the Five Good Emperors, and the last emperor of the Pax Romana, an age of relative peace and stability for the Roman Empire. He served as Roman consul in 140, 145, and 161.

Marcus Aurelius Antoninus may refer to:

Marcus Aurelius was a name used by men from gens Aurelia. The most famous members were the Roman Emperors from the Nerva–Antonine dynasty (among them Caesar Marcus Aurelius Antoninus Augustus, who is known in English world as just Marcus Aurelius) to Marcus Aurelius Valerius Maxentius Augustus (Maxentius) of Diocletian's Tetrarchy.

The reign of Marcus Aurelius began with his accession on 8 March 161 following the death of his adoptive father, Antoninus Pius, and ended with his own death on 17 March 180. Marcus first ruled jointly with his adoptive brother, Lucius Verus. They shared the throne until Lucius' death in 169. Marcus was succeeded by his son Commodus, who had been made co-emperor in 177.

Marcus Aurelius Root (1808–1888) was a writing teacher and photographer. He was born in Granville, Ohio and died in Philadelphia, Pennsylvania.

Pollienus Auspex (fl. late 2nd century and early 3rd century AD) was a Roman military officer and senator who was appointed suffect consul sometime between AD 170 and 174. His praenomen is thought to be Tiberius.