In Greek mythology, Clio (Greek: Κλειώ) or Kleio is the muse of heroic poetry and history. Like all the muses, she is a daughter of Zeus and Mnemosyne. She had one son, Hyacinth, with the King of Macedonia, Pierus. Some sources say she was also the mother of Hymenaios.
She is often represented with a parchment scroll or a set of tablets. She is also known as the Proclaimer.
The name is from the root κλέω/κλείω, meaning "recount" or "make famous".