Cyn may refer to:
Cynthia Nabozny, a singer and songwriter who goes by "Cyn" Cynthia Payne, an English brothel keeper known as Madam Cyn Cyn Santana, a Love & Hip Hop: New York cast member Cyn, a character from the animated YouTube web series Murder Drones Cyclic neutropenia, a hematologic disorder abbreviated as CyN Cylindrospermopsin, a cyanotoxin abbreviated as CYN cyn-, a taxonomic affix meaning dog Cyn.in, an enterprise collaborative software Christian Youth for the Nation, the youth ministry of Jesus Is Lord Church Worldwide Cynwyd Line, abbreviated as CYN, a SEPTA Regional Rail line in Philadelphia and Bala Cynwyd Cary station (North Carolina), abbreviated as CYN, an Amtrak station in Cary, North Carolina Zhongyuan Airlines, a former Chinese airline with ICAO code CYN