Ewa Gentry is a housing development and, as Ewa Gentry, a census-designated place (CDP) located in the Ewa District and the City & County of Honolulu on the leeward side of in about twelve miles (19 km) from Honolulu. As of the 2010 Census, the CDP had a total population of 22,690.
This area was previously known just as Ewa (in Hawaiian, ewa means "crooked"). In the late 19th century to early 20th century, Ewa was one of the large population centers on the Island of Oahu, with industry focused around sugar cane production. The Ewa Mill, in was a major employer that set up residential villages. Sugar cane is no longer grown on the Ewa Plain and Ewa Gentry is now part of Oahu's new suburban growth center—an area of substantial sprawl spreading unbroken to the south to , north to Honouliuli, and west to Kalaeloa and Kapolei. This area is now referred to as Oahu's Second City, with a city center (downtown) located in Kapolei.