Abstract Background: The most common fractured area in children is the supracondylar region and it is the most common operative elbow injuries in children. Aim of Study: To investigate the post-operative effects of low level laser therapy (LLLT) on pain and range of motion (ROM) of affected elbow joint in children with supracondylar fracture. Patients and Methods: Forty four children from both sexes with supracondylar humerus fracture underwent surgical intervention, their ages ranged from 4 to 10 years. They were participated in the study after two weeks from removing the pins and the cast. They were randomly assigned into two equal groups. Control group (A) received traditional exercises program only while study group (B) received LLLT and traditional exercises program. All participants in both groups were evaluated for pain level (pain intensity and pressure pain threshold PPT) and active ROM of their affected elbow joint before and after four weeks of the suggested treatment. Results: There was no significant difference between both groups (control and study) pre-treatment (p>0.05). Comparison between both groups post treatment revealed a significant increase in PPT and elbow flexion and extension ROM, also there was a significant decrease in pain score of the study group compared with that of the control group (p>0.001). Conclusions: Low level laser therapy combined with traditional exercise program can be used post-operative in children with supracondylar humerus fracture for decreasing pain level and increasing ROM of elbow joint.