Chenopodium oahuense is a species of flowering plant in the amaranth family known by the common names aweoweo, alaweo, alaweo huna, aheahea, ahea, ahewahewa, and kahaihai. It is endemic to Hawaii, where it occurs on all of the larger islands except for Kahoolawe. It is also found on Lisianski Island, Laysan, the French Frigate Shoals, Necker Island, and Nīhoa.

This species is a shrub that can reach 5 to 20 meters in height. The fleshy, lightly hairy leaf blades have three lobes. The inflorescence is a panicle of small flowers.

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