Gnaeus Cornelius Lentulus Gaetulicus was a Roman senator, who flourished under the reign of Nero.
He was consul in the nundinium of November to December 55 with Titus Curtilius Mancia as his colleague.
Lentulus belonged to a branch of the Cornelii that had suffered under Nero's predecessors, and "might be expected to harbor resentment against the dynasty".
His father Gnaeus Cornelius Lentulus Gaetulicus, consul in 26, had been executed for his role in a failed attempt to overthrow Caligula.
Judith Ginsburg argues that Gaetulicus' appointment was an attempt to strengthen his position by conciliating favor amongst the Senatorial opposition which was rooted in members who could trace their ancestry from the nobiles of the old Republic.