Cinna, Lucius Cornelius (died 84 B.C.), a Roman consul, and a leader of the popular (antiaristocratic) party. He was elected consul in 87 B.C., after Lucius Cornelius Sulla had driven General Gaius Marius, another leader of the popular party, into exile.

After Sulla left Rome to fight Mithridates the Great in Asia Minor, Cinna called on the freedmen to revolt. As a result, the Senate drove him from the city. He joined forces with Marius, who had returned from exile in Africa, and captured Rome. In 86 B.C. Cinna became consul, ruling Rome until killed in a mutiny of his troops shortly before Sulla's return.

Cinna's daughter Cornelia was the first wife of Julius Caesar. His son, Lucius Cornelius Cinna, was one of the conspirators who plotted Caesar's assassination.