Honolulu Harbor, also called Kulolia and Ke Awa O Kou, is the principal seaport of Honolulu and the State of Hawaiʻi in the United States. It is from Honolulu Harbor, located on Mamala Bay, that the City & County of Honolulu was developed and urbanized, in an outward fashion, over the course of the modern history of the island of Oʻahu. Surrounding Honolulu Harbor is downtown Honolulu.Honolulu Harbor is administered by the Hawaiʻi State Department of Transportation Harbors Division. Honolulu Harbor handles over 11 million tons of cargo annually. The services that the harbor provides are crucial as Hawaiʻi imports over eighty percent of its required goods.

In 1982, the Hawaiʻi Maritime Center was opened near the Aloha Tower in an old royal pier to present the history of Honolulu Harbor and the relative industries it served. Docked at the royal pier is the Falls of Clyde, a historic shipping vessel and Hōkūleʻa, a historic Hawaiian voyaging canoe. In 2002, the Hawaiʻi Maritime Center became an incorporated institution of the Bishop Museum. In 1994, the Aloha Tower Marketplace opened making Honolulu Harbor the only harbor in the nation to combine a visitor attraction, retail and restaurant outlets, and working commercial harbor facilities at a single location.