Kapolei is a planned community in Honolulu County, Hawaiʻi, United States, on the island of Oʻahu. It is colloquially known as the "second city" of Oʻahu, in relation to Honolulu. For statistical purposes, the United States Census Bureau has defined Kapolei as a census-designated place (CDP) within the consolidated city-county of Honolulu.
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, Goddess of Fertility was sister to Pele, Goddess of Fire and Nāmaka, Goddess of the Sea.
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. Kapolei sits primarily upon former sugarcane and pineapple fields.
In 1955 the Kapolei master plan was drafted and revised 3 different times beginning in 1974.