Leonardo III Tocco (after 1436 – before August 1503) was the last ruler of the Despotate of Epirus, ruling from the death of his father Carlo II Tocco in 1448 to the despotate's fall to the Ottoman Empire in 1479. Leonardo was one of the last independent Latin rulers in Greece, and the last to hold territories on the Greek mainland. After the fall of his realm, he fled to Italy, where he became a landowner and diplomat. Leonardo continued to claim his titles in exile until his death.