Introduction : Bilateral hip degenerative arthritis is a frequent nding in 42% population with osteoarthritis. Unbearable pain restrict daily activities of living to a great extent. Bilateral total hip arthroplasty is an well established reconstructive procedure for advanced arthritis. The objective of this study was to evaluate functional outcome of bilateral cementless total hip arthroplasty using Harris Hip Score. A prospective study conducted in 20 patients with 40 hips w Materials And Methods : ere analyzed for clinical and functional outcome. Age, sex , operative indication and preoperative Harris Hip Score were documented. Operative time and complications were noted. Patients were evaluated immediate post operative period ,3 month and at 6 months . Harris Hip Score , Visual Analogue score , range of movement evaluation was done and documented. Mean preoperative Harris hip score w Results : as 38.6 on left side and 39.3 on right side . This score improved to 88.04 on left and 86.03 on right side immediate post operative period and 94 on left and 93 on right side on 6 month followup. A signicant improvement in Visual analogue score (VAS ) and range of movements were observed in post operative follow up. The outcome after bilateral total hip replacement was excellent in 95% and good in 5% of cases. Current generation of prosthesis used in cement less Conclusion : bilateral total hip arthroplasty for degenerative arthritis of hip, provides satisfactory functional and radiological outcomes . It is an effective and safe procedure and improves the quality of life by relieving pain and improving functional disability