Lucius Cornelius Lentulus (c. 42 BC – c. AD 4) was a Roman politician and military officer who served as consul in 3 BC.
A member of the Patrician gens Cornelia, Lentulus was probably the son of Lucius Cornelius Lentulus Cruscellio and Sulpicia. An adherent of Tiberius, Lentulus was elected consul alongside Marcus Valerius Messalla Messallinus in 3 BC, serving the entire year. In around AD 4, he was appointed Proconsular governor of Africa Proconsularis. While governor, he was confronted by uprisings of the native tribes in the south of the province and beyond the borders. During an expedition into the Libyan Desert against one of the tribes, the Nasamones, he was killed.
Lentulus married at some point, although Ronald Syme admits to be uncertain of her identity, suggesting the daughter of Publius Cornelius Scipio, or of Publius Cornelius Lentulus Marcellinus, "yet an Aemilia Lepida is not excluded." They had a daughter, Cornelia Lentula, who married Lucius Volusius Saturninus, the suffect consul of AD 3.