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OTK may refer to: Organisations Austrian Tourist Club (German: or ÖTK) Obrona Terytorium Kraju (ISO 639:otk), territorial defense forces of Poland Obchodní tiskárny Kolín, Czech paper and card manufacturers One True King, a gaming organization based in Austin, Texas Other meanings Technical Control Department (Russian: or ОТК) Old Turkic (language code) One time key, a method related to encryption Otakuthon, Montreal's anime convention Ottakring, the 16th municipal district of Vienna Over-the-knee boots ("OTK boots")