YKK is a Japanese manufacturing group founded in 1934.
YKK may also refer to:
- Union of Communists of Kurdistan (), Turkey (1986–1990s)
- Yokohama Kaidashi Kikou, a sci-fi manga series by Hitoshi Ashinano (1994–2006)
- Kitkatla Water Aerodrome, British Columbia, Canada (IATA:<code>YKK</code>)
- "YKK", a song by Fluke from the album Puppy