Waimānalo Beach is a census-designated place (CDP) located in the City & County of Honolulu, in the District of Koʻolaupoko, on the island of Oʻahu in the U.S. state of Hawaiʻi.

This small windward community is located near the eastern end of the island, and the climate is dry.

This neighborhood is close to, but somewhat separate from Waimānalo, although the two form a single community.

Waimānalo Beach has sparse commercial development along Kalanianaole Highway, and is noteworthy for its local flavor and proximity to Makapuʻu Beach and Sea Life Park, which lie closer to Makapuʻu Point at the east end of the island of Oʻahu.

Kazuo Sakamaki, the first prisoner of war taken by U.S. forces during World War II, was captured on December 8, 1941, on Waimānalo Beach the day after the surprise attack on Pearl Harbor and surrounding targets in Honolulu by Imperial Japanese Navy forces.

8.9% of all households were made up of individuals, and 2.7% had someone living alone who was 65 years of age or older.

Out of the total population, 5.3% of those under the age of 18 and 7.9% of those 65 and older were living below the poverty line.