Kapolei is an unincorporated community in Honolulu County, Hawaii, United States on the island of Oahu. Kapolei is a second urban center for Oahu, second to Honolulu. Popularly called the Second City of Kapolei, it is not a legal municipal corporation and thus not properly a city. Kapolei sits on former sugarcane and pineapple fields.
The community takes its name from a volcanic cone, Puʻu o Kapolei. In the Hawaiian language, puʻu means hill and Kapo lei means beloved Kapo. According to legend, Kapo was sister to Pele.
Much of the land is part of the estate of industrialist James Campbell. Kapolei's major developer is Kapolei Property Development, a subsidiary of James Campbell Company.