The acronym "INS" can refer to:
- Immigration and Naturalization Service (former United States agency, now part of several agencies in the U.S. Department of Homeland Security)
- Indian Naval Ship, formerly Her Majesty's Indian Ship (HMIS) prior to 1950.
- Israeli Naval Ship
- Inelastic neutron scattering
- Inertial navigation system
- The insulin gene
- I Not Stupid; a Singaporean movie released in 2002
- Insert Key of a computer keyboard
- International Necronautical Society
- International News Service
- International Numbering System adopted by the Codex Alimentarius Commission
- Irish Naval Service
- Indian Newspaper Society (formerly Indian and Eastern Newspaper Society)
- Independent National Socialism, a derivative of Nazism
- Indian numbering system
- Israeli new shekel, the currency unit of Israel.