Lahontan can refer to:
- Lake Lahontan
- Lahontan Dam
- Lake Lahontan (reservoir)
- Louis-Armand de Lom d'Arce de Lahontan, Baron de Lahontan
- Lahontan State Recreation Area
- Lahontan, Pyrénées-Atlantiques, a commune in the Pyrénées-Atlantiques département of France