Gnaeus Cornelius Lentulus Marcellinus (c. 90 BC – 48 BC) was a Roman statesman and consul of 56 BC. He was married at least twice. His first wife is unknown but his second wife was probably Scribonia, at least twenty years his junior, who later became the second wife of Augustus.
By his first wife he was the father of Lentulus Marcellinus, Caesar's quaestor put in command of his fortifications at Dyrrhachium in 48 BC; by Scribonia he was father of Cornelius Marcellinus (CIL 6.26033: Libertorum et familiae Scribonae Caes. et Corneli Marcell. f. eius), who probably died before reaching adulthood.
Marcellinus died before 47 BC. Scribonia remarried to Publius Cornelius Scipio Salvito, with whom she had two children Cornelius Scipio and Cornelia Scipio, and later she married Augustus and became mother to his only child, Julia the Elder.