Torda-Aranyos was an administrative county (comitatus) of the Kingdom of Hungary.

Torda-Aranyos county shared borders with the Hungarian counties Arad, Bihar, Kolozs, Maros-Torda, Kis-Küküllő, Alsó-Fehér and Hunyad.

In 1920, by the Treaty of Trianon, the county became part of Romania.

Its territory lies in the present Romanian counties of Cluj (the north, including Turda), Alba (the south and west) and Mureș (the east).

In the early 20th century, the subdivisions of Torda-Aranyos county were: