SET may stand for:
- Sanlih Entertainment Television, a television channel in Taiwan
- Secure electronic transaction, a protocol used for credit card processing,
- Similarity Enhanced Transfer, a technology used to speed up download rate of files on file sharing networks
- Simulated Emergency Test, an amateur radio training exercise,
- Single-Electron Transistor, a device to amplify currents in nanoelectronics,
- Society for the Eradication of Television,
- Society of Engineering Technologists, a student organization at Texas Tech University
- Sony Entertainment Television, a television channel owned by Sony,
- South Eastern Trains now run by Southeastern, a public-owned rail company operating in South East England,
- Stock Exchange of Thailand, a national stock exchange of Thailand,
- SET Index, an index for Stock Exchange of Thailand,
- Study of Exceptional Talent, a program for gifted students with high scores on the SAT in middle school,
- Single-Ended Triode, a type of electronic amplifier,
- Social Entropy Theory, application of entropy concept to maintenace or disorganisation in society,
- School of Engineering Technology,
- Selective Employment Tax, a UK tax on non-productive workers introduced in 1966 and abandoned a few years later,
- Southeast Toyota Distributors, the world's largest privately owned distributor of Toyota vehicles,
- Suzuki SET (Suzuki Exhaust Tuning).
SET may also refer to:
- The DOS command to set environment variables.
