Theodora Tocco (née Maddalena Tocco) (died November 1429) was the first wife of Constantine Palaiologos while he was Despot of Morea. Her husband would become the last Emperor of the Byzantine Empire.
Carlo I was defeated at the Battle of the Echinades by John VIII Palaiologos in 1427. He had to withdraw from the parts of Elis under his control and relinquish his hereditary claims to Corinth and Megara. The agreement was sealed with the marriage of Maddalena to Constantine Palaiologos, younger brother of John VIII.
The marriage occurred in July 1428. She was converted to the Eastern Orthodox Church and took the name "Theodora". During their life together, Constantine held various territories of the Peloponnese under his control though still subordinate to both John VIII and Theodore II Palaiologos, Lord of Morea. Maddalena was thus consort to a minor ruler.
- Nicol, Donald M. (1993-10-29) . The Last Centuries of Byzantium, 1261-1453 (Second Edition ed.). Cambridge University Press. ISBN 0-521-43991-4.
- Sphrantzes, George (June 1980). The Fall of the Byzantine Empire: A Chronicle by George Sphrantzes 1401-1477. Univ of Massachusetts Pr. ISBN 0-87023-290-8.