Marcus Antonius (c. January 14, 83 BC–August 1, 30 BC), known in English as Mark Antony, was a Roman politician and General. His love affair with Cleopatra split the triumvirate he had formed with Octavian and Lepidus and led to war. In 31 B.C. the forces of Antony and Cleopatra were defeated by Octavian at Actium, and both subsequently committed suicide.

He was an important supporter of Gaius Julius Caesar as a military commander and administrator, being the son of one of Caesar's paternal cousins. After Caesar's assassination, Antony formed an official political alliance with Octavian (Augustus) and Marcus Aemilius Lepidus, known to historians today as the Second Triumvirate.

The triumvirate broke up in 33 BC. Disagreement between Octavian and Antony erupted into civil war, the Final War of the Roman Republic, in 31 BC. Antony was defeated by Octavian at the naval Battle of Actium, and in a brief land battle at Alexandria. He committed suicide, and his lover, the Queen Cleopatra of Egypt, killed herself shortly thereafter.