Lucius Calventius Sextus Carminius Vetus was a Roman senator, who was active during the reign of Trajan.
He was suffect consul in the nundinium of September to October AD 83 as the colleague of Marcus Cornelius Nigrinus Curiatius Maternus.
This arose, according to Olli Salomies, apparently because "he was originally a Carminius (Vetus?)
[3] While governor, he sponsored the great grandfather of Titus Flavius Carminius Athenagoras Claudianus, suffect consul around 190 for citizenship; the connection was honored by the man adopting not only elements of emperor Trajan's name for his own (namely "Marcus Ulpius"), but also the proconsul's gentilicum "Carminius", which were passed down to the father of the suffect consul, Marcus Ulpius Carminius Claudianus.
[5] Sextus Carminius Vetus, ordinary consul in 116 is thought to be his son based on similarities of name, and Sextus Carminius Vetus, ordinary consul in 150, is thought to be his grandson.