Waialua is a census-designated place and North Shore community in the Waialua District on the island of Oʻahu, City & County of Honolulu, Hawaii, United States. As of the 2020 census, the CDP had a population of 4,062.

Honolulu County, officially known as the City and County of Honolulu, is a consolidated city-county in the U.S. state of Hawaii. The city-county includes both Urban Honolulu and the rest of the neighborhoods on the island of Oʻahu, as well as several minor outlying islands, including all of the Northwestern Hawaiian Islands except Midway Atoll.