Ku Hyun-jun (; born December 13, 1993) is a South Korean football player who currently plays as a left back for Jeonnam Dragons.
Ku made his debut for Busan IPark on 27 June 2012 in a 5-2 defeat to Jeju United.
Ku completed his military service with K4 League side Siheung Citizen FC before returning to parent club Busan IPark midway through the 2021 K League 2 season.