In Greek mythology who turned Odysseus's companions into swine?

The witch-goddess Circe She was the sorceress daughter of the sun god HeliOS and an ocean nymph.

She turned half of his men into swine after feeding them cheese and wine. Hermes warned Odysseus about Circe and gave Odysseus a drug called moly which gave him resistance to Circe's magic. Odysseus forced the now-powerless Circe to change his men back to their human form.