GTK is a cross-platform widget toolkit for creating graphical user interfaces. GTK may also refer to: Computing Group Temporal Key, in the IEEE 802.11i-2004 wireless network security Other uses GTK (TV series), an Australian TV series Ghost Trackers, a Canadian reality TV show GTK Rossiya, a Russian airline Geologian tutkimuskeskus (Geological Survey of Finland), a Finnish government agency See also gtk--, former name of gtkmm, a C++ interface for GTK