Mierzeń [ˈmjɛʐɛɲ] is a village in the administrative district of Gmina Raciechowice, within Myślenice County, Lesser Poland Voivodeship, in southern Poland. It lies approximately 6 kilometres (4 mi) east of Raciechowice, 20 km (12 mi) east of Myślenice, and 29 km (18 mi) south-east of the regional capital Kraków.