Csanád was an administrative county (comitatus) of the Kingdom of Hungary. Its territory is now in western Romania and southeastern Hungary. The capital of the county was Makó.
Csanád county shared borders with the Hungarian counties Csongrád, Békés, Arad and Torontál. The river Mureş/Maros formed its southern border. Its area was 1715 km2 around 1910.
Csanád county was formed before the 11th century and was named after Castle Csanád, which in turn was named after its first comes, a cousin of Saint Stephen. The Diocese of Csanád was one of the oldest in Hungary. Its first bishop was Saint Gellért.
In 1920, the Treaty of Trianon assigned a small area in the southeast of the county (Nădlac and Şeitin) to Romania. The rest of the county was united with parts of Torontál county (a small area south of Szeged) and Arad county (a small area south of Békéscsaba) to form the new county of Csanád-Arad-Torontál.
After World War II, Csanád-Arad-Torontál county was divided between the Hungarian counties of Békés and Csongrád. The Romanian part of former Csanád county is now part of the Romanian county of Arad.