The Battle of Gerontas () was a naval battle fought close to the island of Leros in the southeast Aegean Sea. On August 29 (julian calendar), 1824, a Greek fleet of 75 ships defeated an Ottoman armada of 100 ships contributed to by Egypt, Tunisia and Algeria. The Battle of Gerontas was one of the most decisive naval engagements of the Greek War of Independence and secured the island of Samos under Greek control.