Background: The term ‘frozen shoulder’ should be reserved for a well-defined disorder characterized by progressive pain and stiffness of shoulder which usually resolves spontaneously after about 18 months. The objectives of treatment are to relieve pain and thus restore motion and function of shoulder. Recommended treatment approaches are physical therapy, local and systemic corticosteroid, anti-inflammatory drugs, antidepressants, nerve blocks and manipulation under anesthesia. Objective: Compare the efficacy of intra-articular corticosteroid injection and phonophoresis in the treatment of Adhesive Capsulitis. Method And Material: : This randomized clinical trial was performed in the Department of Physical Medicine and Rehabilitation, Dhaka Medical College Hospital, Dhaka, Bangladesh, over a period of six months. Study population was the patients of adhesive capsulitis disease attending the out- patient department of Physical Medicine and Rehabilitation during the study period. Meticulous history taking, clinical examination and relevant investigations were done. Eligible participants were allocated into two groups, group A-intra-articular corticosteroid injection and group B- phonophoresis by randomization with the help of lottery. Statistical Analysis: Statistical analysis was performed using the statistical program Statistical Package for Social Science (SPSS) version 16.0. Continuous variables (age, etc) were expressed as mean ± SD and comparison of socio- demographic variable of both groups was measures by chi-square test and outcome variables by t-test. A “p” value <0.05 was considered as significant with 95% confidence interval. Result: The mean age of the patients in this study was 51.47 ± 6.30 years. Out of 74 patients 44 were female & 30 were male and the ratio female: male ratio 1.46: 1. Out of 74patients 40.54% patients had right sided involvement and 59.45% patients had left sided involvement. Among 74 patients, service holder were 25 (33.80%), house wife 23 (31%), reteired (12.16%), labour 5(6.755), teacher 4(5.41%) and others 8(10.81%). Significant difference of VAS score and DASH score between Group A and Group B was found at week 2 and Week 6 follow up (P<0.05). Significant difference was found at week 2 and week 6 follow up (P<0.05) regarding ROM (flexion, abduction, internal rotation, external rotation) in Group A than Group B. Conclusion: Present study shown that intra-articular corticosteroid injection was more effective to reduce pain, improve ROM and disability in adhesive capsulitis.