Which sorceress turns Odysseus's men into pigs?

The sorceress who turns Odysseus's men into pigs is Circe. In Homer's Odyssey, Circe lives on the island of Aeaea and uses magic to transform a group of his sailors after they enter her palace.

Circe first welcomes the men with food and drink, but the meal is enchanted. With a wand, she changes them into swine while leaving their human minds intact. Eurylochus, who is suspicious, stays outside and reports what happened to Odysseus. The hero then confronts Circe with protection from Hermes: the magical herb moly prevents her spell from working on him.

Once Odysseus forces Circe to swear that she will not harm him, she restores the sailors to human form. The crew stays on Aeaea for a year, and Circe later gives Odysseus important instructions for the next stages of his journey, including his visit to the Underworld.

Circe is often confused with Medea, another famous enchantress connected with Jason, or Calypso, the nymph who keeps Odysseus on Ogygia. Helen is not the pig-transforming sorceress in the Odyssey.