Brassó was an administrative county (comitatus) of the Kingdom of Hungary.

The capital of the county was Brassó (Brașov in Romanian, Kronstadt in German).

The river Olt formed part of its northern border.

Brassó County was formed in 1876, when the administrative structure of Transylvania was changed, and was centered on the former Saxon seat of Kronstadt/Brașov.

Its territory lies in the present Romanian county of Brașov.