DOK or Dok may refer to:
- Danube–Oder Canal, a planned and partially constructed artificial waterway in eastern Europe
- Dok Leipzig, a documentary festival in Leipzig, Germany
- DOK (TV series), a Swiss documentary television series
- Donetsk International Airport
- Dok, an ancient fortification on the Mount of Temptation near Jericho
- John "Dok" Hager (1858-1932), cartoonist
- DOK Supermercato, an Italian supermarket