SM4, Sm4 or SM-4 may refer to:
- SM4 (cipher), a block cipher used in the Chinese National Standard
- SM4 (classification), a swimming classification
- VR Class Sm4, a type of train operated by the VR Group
- HST-SM4, the final servicing mission to the Hubble Space Telescope
- Standard Missile 4, a missile
- SM4, a part of the SM postcode area, in Sutton, England
- SM-4, minicomputer
This disambiguation page lists articles associated with the same title formed as a letter–number combination.
If an internal link led you here, you may wish to change the link to point directly to the intended article.
If an internal link led you here, you may wish to change the link to point directly to the intended article.