Pest-Pilis-Solt-Kiskun is the name of an administrative county (comitatus) of the Kingdom of Hungary. Its territory is now in central Hungary, comprising roughly the territory of the present Hungarian county Pest and the northern part of present Bács-Kiskun county. The capital of the county was Budapest.

Pest is a county (vármegye) in central Hungary. It covers an area of 6,393.14 square kilometres (2,468.41 sq mi), and has a population of 1,339,090 (2023). It surrounds the national capital Budapest and the majority of the county's population live in the suburbs of Budapest. It shares borders with Slovakia and the Hungarian counties Nógrád, Heves, Jász-Nagykun-Szolnok, Bács-Kiskun, Fejér, and Komárom-Esztergom. The River Danube flows through the county. The capital of Pest County is Budapest, although Budapest is not part of Pest County. Starting 2018, they also constitute different NUTS:HU level 2 regions, as previously Pest County has lost catch-up aids from the European Union because of the high development of Budapest.