Waiʻōhinu (Hawaiian: Waiʻōhinu; translation: "Shiny Water") is an unincorporated community and census-designated place (CDP) in the district of Kaʻu on the Big Island of Hawaiʻi, in the U.S. state of Hawaiʻi.

As of the 2020 American Community Survey, Waiʻōhinu had a population of 220 residents, of whom 50 were Native Hawaiian or other Pacific Islanders, 39 were Asian, 31 were white, and 100 were two or more races.

According to the U.S. Census Bureau, the Waiʻōhinu CDP has an area of 1.4 square miles (3.5 km2), all of it land.

[5] Mark Twain visited Waiʻōhinu in 1866 and, legend has it, planted a monkey pod tree (Albizia saman) here.

The historic wooden church building was demolished in April 1998 because of extensive termite damage.