Kīhei is a census-designated place (CDP) in Maui County, Hawaiʻi, United States. The population was 20,881 at the 2010 census.
According to the United States Census Bureau, the CDP has a total area of 11.7 square miles (30.2 km2), of which 9.3 square miles (24.0 km2) is land and 2.4 square miles (6.2 km2), or 20.44%, is water. It is considered to be the South Side of Maui, located on the leeward side of Haleakala. The climate is arid, receiving no more than 10 inches (250 mm) of rain per year.