SMW is an abbreviation that may stand for
- Super Mario World, a video game in the Super Mario series by Nintendo
- Smoky Mountain Wrestling, a defunct wrestling organization run by Jim Cornette.
- "Springfield's Most Wanted", a television special related to The Simpsons
- Strategic Missile Wing, US Air Force designation for military units which house nuclear missiles under Strategic Air Command
- Sherman–Morrison–Woodbury formula, a matrix identity used in linear algebra
- Special Marine Warning, a weather warning issued by the US National Weather Service for lakes, rivers, or other bodies of water.
- Semantic MediaWiki, a software extension to MediaWiki
- Saab Microwave Systems, a division of the Saab corporation