St is a common abbreviation for:
ST, St or st may also mean:
- Atari ST, a computer
- Saint Lucia, NATO country code
- Sanitary towel
- São Tomé and Príncipe, ISO country code
- Scheduled tribes, the disadvantaged tribes of India commonly known as Adivasi
- Sesotho language, ISO language code
- Star Trek
- Starship Troopers
- Starship Troopers (film)
- STMicroelectronics, a worldwide manufacturer of semiconductors
- Stone (weight), a unit of mass
- The Straits Times, a Singaporean broadsheet
- ST connector, a type of optical fiber connector
- Stanton number, in physics
- State Trooper
- Springfield Terminal Railway, AAR reporting mark