ancient Italian rural deity whose attributes in Classical Roman times were identified with those of the Greek god Pan. Faunus was originally worshipped throughout the countryside as a bestower of fruitfulness on fields and flocks. He eventually became primarily a woodland deity, the sounds of the forest being regarded as his voice.

A grandson of Saturn, Faunus was typically represented as half man, half goat, in imitation of the Greek Satyr, in the company of similar creatures, known as fauns. Faunus was the father of Latinus, who was king of the Latins when Aeneas arrived in Italy. According to Virgil's Aeneid, Faunus told Latinus to give his daughter, Lavinia, in marriage to a foreigner—i.e., Aeneas. Like Pan, Faunus was associated with merriment, and his twice-yearly festivals were marked by revelry and abandon. At the Lupercalia, a celebration of fertility held partly in his honour each February in Rome well into the Common Era, youths clothed as goats ran through the streets wielding strips of goatskin.