Ahi may refer to:
- Ahi (Biblical figure), son of Abdiel
- Ahi (Hinduism), an epithet of Vritra
- Ahi (language)
- Ahi (political party), a political party in Israel
- Ahi Evren
- Ahi Beylik a middle age principality in Turkey
- Yellowfin tuna, commonly referred to as ahi tuna from its Hawaiian name.
- Bigeye tuna, one of two fish called ahi in Hawaiian.
- Azrak-Hamway International, Inc., a defunct toy company based in New York
AHI may also refer to:
- Adventist Health International
- AHI (Amiga), audio standard
- apnea-hypopnea index of sleep apnea severity
- AHI, the IATA code for Amahai Airport, Indonesia