Yn (disambiguation)
Yn is a letter of the old Romanian Cyrillic alphabet.
YN or Yn may also refer to:
- Yeoman (United States Navy), a rank
 - A US Navy hull classification symbol: Yard net tender (YN)
 - Yoctonewton, a unit of force equal to 10−24 newtons
 - Yottanewton, a unit of force equal to 1024 newtons
 - Triple bond, in a chemical compound
 - 2C-YN, an analogue of the phenethylamine derived hallucinogen 2C-E
 - Yes–no question
 - Yunnan, a province of China (Guobiao abbreviation YN)
 - Y/N, a 2023 novel by Esther Yi
 - Yttrium nitride
 - Your Name