Klasterec nad Ohrí is a town in the Ustí nad Labem Region of the Czech Republic. The River Ohře runs through the town.
The town has around 15,700 inhabitants. Parts of the town are affiliated villages Miřetice (now the modern part of the town with a lot of prefabricated houses), Cibousov, Klasterecka Jesen, Lestkov, Mikulovice, Rašovice, Sumna, Vernerov, Hradiste, Kunov, Horní Miretice, Pavlov, Potocna, Suchy Dul, Útociste, and Velka Lesna
