Nicholas I Sanudo (or Niccolò; died 1341) was the fifth Duke of the Archipelago from 1323 to his death.
Nicholas fought under his brother-in-law Walter, Duke of Athens, at the disastrous Battle of Halmyros on 15 March 1311.
[1] He fought in John of Gravina's futile siege of the castle of Karytaina, and when John left the Morea in spring 1326, he entrusted Nicholas with the conduct of military operations.
At some point thereafter, he scored a success against a numerically superior Byzantine army that was raiding the Principality.
Nicholas was married to Joanna of Brienne, the daughter of Hugues de Brienne, Count of Lecce (c. 1240 – 1296) and Helena Komnene Doukaina, a daughter of John I Doukas of Thessaly.