Międzyrzecz (Polish pronunciation: [mʲɛnˈd͡zɨʐɛt͡ʂ] ; Latin: Meserici, German: Meseritz, Yiddish: מעזריטש, romanized: Mezrits) is a town in western Poland, on the Obra and Paklica river, with 17,667 inhabitants (2020). The capital of Gmina Międzyrzecz and Międzyrzecz County in Lubusz Voivodeship.
Founded in the 9th century, Międzyrzecz is a former royal city of Poland. It contains heritage in various styles, including Gothic, Baroque and Neoclassical, including a medieval Royal Castle, listed as a Historic Monument of Poland. During World War II, it was the site of German Nazi atrocities in which more than 10,000 people were killed.