The Justice Party held a leadership election between 6 and 18 July 2015. It was an election to elect a new leader as Cheon Ho-sun fulfilled his two-year term of office.
The election was held only by the votes of the party members. The first round of voting was held from 6 to 11 July 2015. Candidate Roh Hoe-chan and Sim Sang-jung, who won the first and second votes respectively, entered the final vote. The final round of voting was held from 11 to 18 July 2015.