Gaius Julius Solinus, Latin grammarian and compiler, probably flourished in the early third century. Historical scholar Theodor Mommsen dates him to the middle of the third century.

He was the author of De mirabilibus mundi ('The wonders of the world') which circulated both under the title Collectanea rerum memorabilium ('Collection of Curiosities'), and Polyhistor; but the latter title was favoured by the author. The work is indeed a description of curiosities in a chorographical framework. Adventus, to whom it is dedicated, is identified with Oclatinius Adventus, consul 218. It contains a short description of the ancient world, with remarks on historical, social, religious and natural history questions. The greater part is taken from Pliny's Natural History and the geography of Pomponius Mela.

According to Mommsen, Solinus also used a chronicle (possibly by Cornelius Bocchus) and a Chorographia pliniana, an epitome of Pliny's work with additions made about the time of Hadrian. Schanz, however, suggests the Roma and Prata of Suetonius.