DYK or Dyk may refer to:
- Dyk (surname) or Van Dyk, a surname
- Dongfeng Yueda Kia, a joint automotive manufacturing venture between the Dongfeng Motor Corporation, Kia Motors, and Yueda
- Underwater Demolition Command (Greek: Διοίκηση Υποβρυχίων Καταστροφών), Greek Navy's special warfare unit
- Devil You Know (band), an American rock band