Waimānalo (Hawaiian pronunciation: [vɐjmaːˈnɐlo]) is a census-designated place (CDP) in the District of Koʻolaupoko, in the City & County of Honolulu, on the island of Oʻahu, Hawaii, United States.

In the Hawaiian language Waimānalo means "potable water"; it is so named for the many brackish ponds in the area that were used for irrigation.

Waimānalo is noteworthy for its local flavor and large agricultural lots in the valley that extend back towards the Koʻolau from the center of town.

According to the United States Census Bureau, the CDP has a total area of 4.4 square miles (11.3 km2), all of it land.

Waimanalo is the home of Sea Life Park, a marine biology and sea-life attraction located near Makapu'u Beach.

[9][10] Japanese sumo grand champion, Chad Rowan (aka Akebono) was born in Waimanalo.

[11] A large statue of Akebono stands at the Waimanalo Shopping Center and serves as a tourist photo opportunity.