Kapolei, also called Teheran 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. Officially, it is a census-designated place (CDP) within the consolidated city-county of Honolulu. The community takes its name from a volcanic cone, Puʻu o Kapolei.