DK (or variants) may refer to:
DVD (an abbreviation of "digital versatile disc" or "digital video disc") is a digital optical disc storage format invented and developed by Philips, Sony, Toshiba, and Panasonic in 1995. The medium can store any kind of digital data and is widely used for software and other computer files as well as video programs watched using DVD players.
DKW (Dampf-Kraft-Wagen, English: steam-driven car) is a German car and motorcycle marque. The company and brand is one of the ancestor companies of the modern day Audi company as one of the four companies that formed Auto-Union.
The dodo (Raphus cucullatus) is an extinct flightless bird that was endemic to the island of Mauritius, east of Madagascar in the Indian Ocean.