In this study which was carried out in the stone pine afforestations in Bartın-Karaçaydere district, the effects ofpurning applications on height and diameter growth of stone pine trees at the end of the 5th year following the purining were investigated. According to results obtained from measurements and determinations, it was determined that there were significant differences between the pruned and control trees in terms of height and diameter at P<0.05 and P<0.01 significance levels respectively. At the end of the 18th year, the mean height of control stone pine trees was 8,3 m and pruned trees was 10,5 m respectively. The mean diameter of control stone pine trees was 24,2 cm and pruned trees was 36,3 cm respectively. These results showed that pruningapplications had a positive effect on the height and diameter growth of stone pine.