Komárom is a city in Hungary on the south bank of the Danube in Komárom-Esztergom County. Komárno, Slovakia, is on the northern bank. Komárom was formerly a separate village called Újszőny. In 1892 Komárom and Újszőny were connected with an iron bridge and in 1896 the two towns were united under the name city of Komárom. The fortress played an important role in the Hungarian Revolution of 1848 and many contemporary English sources refer to it as the Fortress of Comorn.

Komárno, colloquially also called Révkomárom, Öregkomárom, Észak-Komárom in Hungarian, is a town in Slovakia at the confluence of the Danube and the Váh rivers. Historically it was formed by the "old town" on the left bank of Danube, present day Komárno in Slovakia, and by a "new town" on the right bank, present day Komárom in Hungary, which were historically one administrative unit. 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 independent towns in two countries. Komárno and Komárom are connected by the Elisabeth Bridge, which used to be an official border crossing between Slovakia and Hungary until border checks were lifted due to the Schengen Area rules. In 2020, a new road bridge was opened.