Marcus Aurelius Carinus was Roman Emperor from 283 to 285. The eldest son of the Emperor Carus, he was first appointed Caesar in late 282, then given the title of Augustus in early 283, and made co-emperor of the western part of the Empire by his father. Official accounts of his character and career, which portray him as dissolute and incompetent, have been filtered through the propaganda of his successful opponent Diocletian.

The Roman emperor was the ruler and monarchical head of state of the Roman Empire, starting with the granting of the title augustus to Octavian in 27 BC. The term "emperor" is a modern convention, and did not exist as such during the Empire. Often when a given Roman is described as becoming emperor in English, it reflects his taking of the title augustus and later basileus. Another title used was imperator, originally a military honorific, and caesar, originally a surname. Early emperors also used the title princeps alongside other Republican titles, notably consul and pontifex maximus.