Abstract Background: Globally, burns are a serious public health problem and Knee post burn scar flexion contractures, makes up 22% of large joint contractures. Stretching is effective method to improve muscle length and mulligan bent leg raise is a modification of straight leg raise which increase hamstring flexibility and length. Aim of Study: This study has been conducted to evaluate the effect of the mulligan bent leg raise technique on elongation of hamstring muscle and the reflection of that on some quan-titative gait parameters and the range of motion (ROM) of knee extension. Patients and Methods: Thirty male patients between 30- 50 years were participated in this study, with a second-degree posterior leg burn and a total body surface area of 15-20%. They were divided randomly into two equal groups, study group (A), 15 patients received mulligan bent leg raise technique plus the traditional physical therapy program and control group (B), 15 patients received only the same traditional physical therapy program. Measurements were recorded before treatment and after third, sixth and eighth week of treatment (session for 30 minutes, 5 days/week for a total period of 2 months). A 16-meter walkway and tape measure were used to measure the quantitative gait parameters, while manual goniometer was used for measuring ROM of knee flexion. patients were exam-ined at the outpatient clinic of Cairo University during the period from December 2020 to February 2021. Results: There was a significant decrease in knee flexion ROM and step width and a significant increase in step length and stride length of the study group (group A) at post I, post II and post III compared with that of the control group (group B) (p < 0.001). Conclusion: It is concluded that the mulligan bent leg raise technique is effective in elongating the hamstring muscle as reflected by the improved gait parameters as well as the ROM of knee extension.