OTK

{{wiktionary|OTK|otk}}

OTK may refer to:

;Organisations

• Austrian Tourist Club (German: {{lang|de|Österreichische Touristenklub}} 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: {{lang|ru|Отдел технического контроля}} 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")

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