Silvanus (/sɪlˈveɪnəs/; meaning "of the woods" in Latin) was a Roman tutelary deity of woods and fields. As protector of forests (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 as Mars Silvanus. In the provinces outside of Italy, Silvanus was identified with numerous native gods:
The Slavic god Porewit has similarities with Silvanus.
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.