Karahallı District is a district of the Uşak Province of Turkey. Its seat is the town of Karahallı. Its area is 330 km2, and its population is 9,664 (2022). Karahallı district area neighbors those of two other districts of the same province to the north, namely Ulubey District and Sivaslı District, and to the south those of two districts depending Denizli Province which are Çivril and Bekilli. The district area is crossed by Banaz Stream and is divided roughly equally between agricultural lands and woodland, mostly oaks.