Depending on context, the initials SMS may have several meanings:

• Short message service – text messaging on mobile phones / cell phones
• Sega Master System – an 8-bit video game console from the 1980s, competing with the Famicom and the NES
• Seiner Majestät Schiff – "His Majesty's Ship" in the German Kaiserliche Marine
• "Sixth Man Syndrome " – in Star Trek, the unfortunate fate of many a crew member who accompanied the regular five-man crew (Captain Kirk, Mr. Spock, Bones, Mr. Chekov, and Mr. Sulu) as sixth member of an away team.
• Southwest Missouri State University
• Stranka mladih Slovenije – Youth Party of Slovenia political party
• Systems Management Server – Microsoft product to remotely manage Microsoft-based computer systems
• Sonar Middleware Standard – A publication of the Naval Undersea Warfare Center