Szkieletor (Skeletor) is the unofficial name of a 92 metre high-rise building in Kraków, Poland, originally intended to become the regional office of the Main Technical Organization (Naczelna Organizacja Techniczna, NOT) and be named the NOT Tower. The construction of the building was started in 1975, but was stopped permanently in 1981 because of economic constraints, political unrest and the imposition of martial law in Poland.