Baja is a city with county rights in Bács-Kiskun County, southern Hungary. It is the second largest city in the county, after the county seat at Kecskemét, and is home to some 35,000 people. Baja is the seat of the Baja municipality.

Bács-Kiskun is a county located in southern Hungary. It was created by the merger of the pre-World War II Bács-Bodrog and the southern parts of Pest-Pilis-Solt-Kiskun counties. With an area of 8,445 km2, Bács-Kiskun is the largest county in the country, slightly larger than Cyprus. The terrain is mostly flat with slight emergences around Baja. The county seat and largest city of Bács-Kiskun is Kecskemét.