Yuma (Cocopah: Yuum) is a city in and the county seat of Yuma County, Arizona, United States. It is located in the southwestern corner of the state, and the population of the city was 93,064 at the 2010 census, increased from the 2000 Census Bureau population of 77,515.

Yuma is the principal city of the Yuma, Arizona Metropolitan Statistical Area, which consists of Yuma County. According to the United States Census Bureau, the 2008 estimated population of the Yuma MSA is 194,322, though more than 85,000 retirees make Yuma their winter residence.