Komarno may refer to:

• Komárno, a town in Slovakia
• Komarno, Lviv Oblast, a city in Ukraine
• Komarno (Hasidic dynasty)
• Komárom, a city in Hungary
• Komárom county, Hungary

• Komarno, Lower Silesian Voivodeship, a village in south-west Poland
• Komarno, Lublin Voivodeship, a village in east Poland
• Komarno, a settlement in Crmnica, Montenegro

Komárno (, colloquially Révkomárom, Öregkomárom, Észak-Komárom, , ) is a town in Slovakia at the confluence of the Danube and the Váh rivers. Komárno was formed from part of a historical town in Hungary situated on both banks of the Danube. Following World War I and the Treaty of Trianon, the border of the newly created Czechoslovakia cut the historical, unified town in half, creating two new towns. The smaller part, based on the former suburb of Újszony, is in present-day Hungary as Komárom (the historical Hungarian town had the same name). Komárno and Komárom are connected by the Elisabeth Bridge, which used to be a border crossing between Slovakia and Hungary until border checks were lifted due to the Schengen Area rules.