Silvanus (; meaning "of the woods" in Latin) was a Roman tutelary deity of woods and fields. As protector of the forest (sylvestris deus), he especially presided over plantations and delighted in trees growing wild. He is also described as a god watching over the fields and husbandmen, protecting in particular the boundaries of fields. The similarly named Etruscan deity Selvans may be a borrowing of Silvanus, or not even related in origin.
Silvanus is described as the divinity protecting the flocks of cattle, warding off wolves, and promoting their fertility.Dolabella, a rural engineer of whom only a few pages are known, states that Silvanus was the first to set up stones to mark the limits of fields, and that every estate had three Silvani:
Hence Silvani were often referred to in the plural.
Like other gods of woods and flocks, Silvanus is described as fond of music; the syrinx was sacred to him, and he is mentioned along with the Pans and Nymphs. Later speculators even identified Silvanus with Pan, Faunus, Inuus and Aegipan. He must have been associated with the Italian Mars, for Cato refers to him consistently as Mars Silvanus. These references to Silvanus as an aspect of Mars combined with his association with forests and glades, give context to the worship of Silvanus as the giver of the art (techne) of forest warfare. In particular the initiation rituals of the evocati appear to have referenced Silvanus as a protective god of raiding for women and cattle, perhaps preserving elements of earlier Etruscan worship. 
In the provinces outside of Italy, Silvanus was identified with numerous native gods:
The sacrifices offered to Silvanus consisted of grapes, ears of grain, milk, meat, wine and pigs. In Cato's De Agricultura an offering to Mars Silvanus is described, to ensure the health of cattle; it is stated there that his connection with agriculture referred to only the labour performed by men, and that females were excluded from his worship. (Compare Bona Dea for a Roman deity from whose worship men were excluded.) Virgil relates that in the very earliest times the Tyrrhenian Pelasgians had dedicated a grove and a festival to Silvanus.
In works of Latin poetry and art, Silvanus always appears as an old man, but as cheerful and in love with Pomona. Virgil represents him as carrying the trunk of a cypress (Greek: ), about which the following myth is told. Silvanus - or Apollo according to other versions - was in love with Cyparissus, and once by accident killed a pet hind belonging to Cyparissus. The latter died of grief, and was metamorphosed into a cypress.
In Edmund Spenser's epic poem The Faerie Queene (1590-96), Silvanus appears in Canto VI of Book I. His 'wyld woodgods' (Stanza 9) save the lost and frightened Lady Una from being molested by Sans loy and take her to him. They treat her as a Queen because of her great beauty. Spenser writes in Stanza 14: