Šabac (Serbian Cyrillic: Шабац, ) is a city and municipality in western Serbia, along the Sava river, in the historic region of Mačva. It is the administrative center of the Mačva District. The city has a population of 52,822 (2011), while population of the municipality is 115,347. Šabac acquired city rights in 2007, after a partial restructuring of local government in Serbia.