9Y

9Y or 9-Y may refer to:


 * 9 years
 * 9Y, IATA airline code for Air Kazakhstan, which went bankrupt in 2004
 * 9Y, international code identifying airplanes from the state of Trinidad and Tobago
 * Salmson 9Y, a model of Salmson 9
 * USP9Y, or Ubiquitin specific peptidase 9, Y-linked
 * 9Y, Aircraft registration for Trinidad and Tobago