Polyhymnia ("many songs"), in Greek mythology, was the Muse of sacred hymn and eloquence.

She is a very serious woman, pensive and meditative. She is often depicted holding a finger to her mouth, dressed in a long cloak and veil and resting her elbow on a pillar. She brings fame to writers whose works have won them immortal fame. Polyhymnia is also sometimes known as the muse of geometry, mime, meditation, and agriculture.