SM or sm may refer to:
Smallville is an American television series developed by writer-producers Alfred Gough and Miles Millar, based on the DC Comics character Superman created by Jerry Siegel and Joe Shuster.
Smallpox was an infectious disease caused by either of two virus variants, Variola major and Variola minor.
A smartphone is a mobile personal computer with a mobile operating system with features useful for mobile or handheld use.
Short Message Service (SMS) is a text messaging service component of most telephone, World Wide Web, and mobile telephony systems.
A smart card, chip card, or integrated circuit card (ICC) is any pocket-sized card that has embedded integrated circuits.
Smoking is a practice in which a substance is burned and the resulting smoke breathed in to be tasted and absorbed into the bloodstream.