STK

STK may refer to:

• Satellite Tool Kit, an astrodynamics computer program from Analytical Graphics, Inc.
• SIM Application Toolkit, a part of GSM telephony standard responsible for applications stored on SIM
• Storage Technology Corporation (StorageTek), a data storage company acquired in 2005 by Sun Microsystems
• SuperTuxKart, an arcade racing game
• Synthesis Toolkit, a cross-platform library in C++ for sound synthesis and physical modelling