STK

STK may refer to:
 * Systems Tool Kit (formerly 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

SKT