Cache County is a county located in the U.S. state of Utah. Its county seat and largest city is Logan. Cache County borders the state of Idaho to the north, Rich County to the east, Weber County to the south, and Box Elder County to the west. The county was created in 1856 and organized the next year. It was named for the fur stashes made by many of the Rocky Mountain Fur Company trappers.
The Cache Valley and surrounding mountains are located in the county, which reaches up to the Idaho border. The Bear River Mountains, the northernmost extension of the Wasatch Range, which reach as high as 10,000 feet, cover the eastern half of the county. The Bear River flows through Cache Valley. Wellsville was the first European settlement in the county, settled by Peter Maughan in 1853.
Cache County is included in the Logan, UT-ID Metropolitan Statistical Area.