Background and Purpose: Upper crossed syndrome arises from the imbalance between the muscle functions. During the working hours, particular posture may be adapted by body muscle forces may transferred improperly on the body, and may alter the mechanics of joint. The purpose of study is to study the effect of muscle energy technique on muscle strength, length and disability in patients with upper crossed syndrome (UCS). Methodology: 28 participants were selected on the basis of forward head posture and pectoralis minor tightness. All the participants were randomly allocated into two groups. The self-stretching or control group and MET or experimental group. PML, NDI, and Deep cervical flexor strength were assessed on pre- intervention and post-intervention after 4weeks. Result: Wilcoxon signed rank test and Mann Whitney U Test was used for analysis the data. Between group comparison showed more significant improvement in PML and NDI, p value <0.05 in MET group compared to control group. Conclusion: Result of this study concluded that, 4 weeks of MET program had greater effect compared to control group for improving muscle length and functional disability while both the techniques are equally effective to improve neck flexor strength and forward head posture in patients with UCS.