Lucius Ragonius Venustus (fl. 3rd century) was an aristocrat of the Roman Empire. He was appointed consul ordinarius in 240. X. Loriot describes Ragonius Venustus as an example of the "new generation of clarissimi" that emerged under the reign of Alexander Severus. As the son and grandson of consuls, he attained the consulate without necessarily having served as military tribune, legate of a legion, or provincial governor, unlike his colleague Gaius Octavius Appius Suetrius Sabinus.