Background: Adhesive capsulitis is typically marked with pain and a gradual and limitation in shoulder range of motion due which gravely affect the activities of daily living in patients. Extracorporeal Shockwave Therapy (ESWT) has been extensively used as an alternate to its surgical management but its long term effects on function are not still reported. Objective: To determine the Effects of Extracorporeal Shockwave Therapy in Long Term Functional Outcomes of Shoulder Adhesive Capsulitis. Methods: An interventional randomized controlled trial was conducted at Horizon Hospital Lahore, from July 2020 to December 2020. On the basis of inclusion criteria, 50 patients were included after obtained informed consent and randomly divided into two equal groups. Group A was given extracorporeal shockwave therapy along with conventional therapy while group B was only given conventional therapy. Both groups were assessed by using Constant Shoulder Scale (CSS) and Oxford Shoulder Score (OSS) at baseline, 4th, 8th, 12th and 24th week of treatment. The data was entered and analyzed using SPSS 21. Results: Findings revealed that differences between two groups were found to be statistically important, CSS score in ESWT group and conventional group were 86.67 plus or minus 5.15 vs. 73.14 plus or minus 1.52 points (p-value less than or equalto 0.05), respectively and OSS score was in both groups, 54.24 plus or minus 1.14 vs. 38.95 plus or minus 1.40 points (p-value than or equalto 0.05), respectively at 24th week of follow-up. Conclusion: Extracorporeal shockwave therapy and conservative therapy both were effective in reducing pain and improving function in adhesive capsulitis patients.