Zaránd County (, ) was an administrative unit of the Kingdom of Hungary and the Principality of Transylvania from the middle ages until 1876. Located mainly in the Fehér-Körös/Crișul Alb river valley, today its former territory lies mostly in Romania, with a small amount in south-eastern Hungary.
In the 16th century Zaránd was part of the Eastern Hungarian Kingdom and later the Partium territories of the Principality of Transylvania. It returned to Habsburg Hungary in 1699.
In 1744 most of the western territory of Zaránd County, including its capital Zaránd/Zărand, was transferred to Arad County; Körösbánya/Baia de Criș became the capital of the new rump county.
During a period of significant administrative reform in the Austrian Empire following the Revolutions of 1848 the traditional counties of Transylvania (including the Partium territories of Zaránd, Kraszna, Közép-Szolnok and Kővár) were abolished and reorganised into five (districts; literally "circles") in 1851; Zaránd's territory was incorporated into the of Karlsburg. In 1854 the system was revised significantly with the previously five becoming ten; Zaránd's territory became part of the new of Broos. The pre-1848 counties, including Zaránd, were restored in 1860.
Zaránd county was finally permanently dissolved as part of the 1876 administrative reform in the Lands of the Crown of Saint Stephen; most of its territory became part of Hunyad County as the Körösbánya and Brád districts, with a smaller western part being merged into Arad county as the district of Nagyhalmágy.