Kahu or KAHU may refer to:
- KAHU (FM), a radio station (91.3 FM) licensed to serve Pahala, Hawaii, United States
- KIPA (AM), a radio station (1060 AM) licensed to serve Hilo, Hawaii, which held the call sign KAHU from 1984 to 2003
- HMNZS Kahu (A04), a Moa class inshore patrol vessel of the Royal New Zealand Navy
- HMNZS Kahu (P3571), a Fairmile B motor launch of the Royal New Zealand Navy
- Project Kahu, a major upgrade for the A-4 Skyhawk fighter jet
- Swamp harrier, a large, slim bird of prey in the family Accipitridae (also known by the Māori-language name kāhu)
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