INSA may refer to:
- Intelligence and National Security Alliance, an alliance of intelligence business interests.
- Indian National Science Academy, the science society in Delhi
- Institut national des sciences appliquées (National Institute of Applied Sciences)
- Instituto Nacional de Saúde Dr. Ricardo Jorge, the National Health Institute of Portugal
- Israeli Nano Satellite Association
- Insa AD Serbian clock factory founded in 1950
Insa is also a Frisian variant of the name Ingeborg.
INSA (stands for I Need Some Answers) is the fourth and final mixtape by Odd Future sub-group MellowHype. Production for the mixtape was handled by Left Brain. It was made available for free download on July 4, 2014.