Békés was an administrative county (comitatus) of the Kingdom of Hungary. Its territory, which was smaller than that of present Békés county, is now in southeastern Hungary. The capital of the county was Gyula.
Békés county shared borders with the Hungarian counties Csongrád, Jász-Nagykun-Szolnok, Hajdú, Bihar, Arad and Csanád. The river Körös flowed through the county. Its area was 3,670 km2 around 1910.
Békés county arose as one of the first comitatus of the Kingdom of Hungary, in the 11th century. In 1950, the territory of Békés county was expanded with:
In the early 20th century, the subdivisions of Békés county were: