Gnaeus Octavius was consul of the Roman Republic in 87 BC. He quarrelled with his colleague, Lucius Cornelius Cinna, and drove him out of Rome. He was subsequently killed when Cinna marched on Rome with Gaius Marius. Plutarch, who discusses him in his lives of Marius and Sulla, describes his character as "reputable". He held to strict principles in his politics, and his peers had a low opinion of his military generalship. Suetonius identifies him as an ancestor of Caesar Augustus.