Introduction: Patient-related factors and dental implant-related factors play an important role in deciding the outcome of treat ment. A bone quantity such as sufficient width, length and bone quality is patient-related factors whereas dental implant size such as length, width, prosthetic part and implant design is dental implant-related factors. Objectives: The objective was to evaluate the risk factors for dental implant failure. Materials and Method: This retrospective study was conducted on 200 patients with 252 implants placed in both genders. Factors such as implant diameter, length and bone quality were detailed. The existence of mobility of dental implant, pain or discomfort, peri-implant radiolucency, __ampersandsigngt;2 mm bone loss around the dental implant was regarded as implant failure. Results: Out of 200 patients, 112 (56 %) were males with 135(53.6%) implants and 88 (44 %) were female with 117 (46.4%) dental implants. There were 34 (13.4%) dental implant failure of which 18 (7.1 %) were in male and 16 (6.3 %) in the female. The difference found to be significant (P__ampersandsignlt; 0.05). Maximum dental implant failure was seen in with 10 mm length (3, 8.9%). The difference found to be significant (P__ampersandsignlt; 0.05). Maximum dental implant failure was seen in dental implant with 3.5 mm diameter 3 (8.9%). Maximum dental implant failure was seen with type IV bone was 7 (20.6%) followed by Type III of 4 (11.8%), Type II with 3 (8.9%) and least with Type I with 1 (2.9%). Conclusion: It was observed that dental implant failure was maximum with implant length less than 10.0 mm, with lesser than 3.75 mm diameter and type IV bone.