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