Tek can refer to:
- Tek, shorthand for Tektronix.
- TEC-9 9mm firearm
- Tek, a member of the hip-hop group Smif-N-Wessun.
- Tek (drug), a fictional substance in the TekWar universe.
- Jason Varitek, a baseball catcher for the Boston Red Sox.
TEK can refer to:
- Traffic encryption key
- Test of Economic Knowledge (TEK), a standardized test of economics
- TEK tyrosine kinase
- Traditional Environmental Knowledge, (TEK) knowledge of the environment in a given place.
- TEK search engine ("Time Equals Knowledge"), an email-based search engine
- Tekniikan Akateemiset (TEK), the Finnish Association of Graduate Engineers
- Teen Evil King
- Terrorelhárítási Központ, a Hungarian police agency charged with counter-terrorism operations