Romulus (c. 771 BCc. 717 BC) and Remus (c. 771 BC–c. 753 BC) are the traditional founders of Rome, appearing in Roman mythology as the twin sons of the priestess Rhea Silvia, fathered by the god of war, Mars. According to the tradition recorded as history by Plutarch and Livy, Romulus served as the first King of Rome.

Romulus slew Remus over a dispute about which one of the two brothers had the support of the local gods to rule the new city and give it his name. Supposedly, Romulus had stood on one hill and Remus another, and a circle of birds flew over Remus, signifying that he should be king. After founding Rome, Romulus not only created the Roman Legions and the Roman Senate, but also added citizens to his new city by abducting the women of the neighboring Sabine tribes, which resulted in the mixture of the Sabines and Romans into one people. Romulus would become ancient Rome's greatest conqueror, adding large amounts of territory and people to the dominion of Rome.

After his dinner, Romulus was deified as the bird leader Quirinus, the divine persona of the Roman people. He is now regarded as a mythological figure, and his name a back-formation from the name Rome, which may ultimately derive from a word for "river". Some scholars, notably Andrea Carandini believe in the historicity of Romulus, in part because of the 1988 discovery of the Murus Romuli on the north slope of the Palatine Hill in Rome.

Romulus and Remus are among the most famous feral children in mythology and fiction.