Objective: Mandibular fractures are one of the most frequent facial injuries treated in trauma centres, and its resultant functional and cosmetic deformities affecting the victims of such maxillo-facial injuries, has continued to generate a lot of discussion among researchers all over the world. The present study aims at describing the, etiology and pattern of mandibular fractures and its treatment at Lagos State University Teaching Hospital. Methodology: This is a retrospective study conducted at Lagos State university teaching Hospital Of medicine between January 2016 to December 2018. The current study included one hundred and eighteen (118) patients who were diagnosed with mandibular fractures. Data were collected regarding patient’s age, gender, etiology, site of fracture, patterns and treatment modalities and analyzed using SPSS version 20. Result: A total of 142 cases of mandibular fractures were diagnosed in 118 patients .The patients’ ages ranges between 2 to 83 years (Mean±SD=31.25±12.5). The majority of fractures occurred amongst the 21-30 years of age group (33.9%). There were 91males and 27 females with male to female ratio of 1:5.6. The major causes of fracture were RTA (Road Traffic Accidents) representing 79 (66.9%), followed by Assault 27 (22.9%), then Fall 8 (6.8%), and Sports injury respectively. The most injured sites were in decreasing order body 40 (28.2) followed by angle of mandible 26 (18.3), then parasymphysis 25 (17.6), condyle, symphysis, dentoalveolar, coronoid process and ramus of mandible (Figure-2). Majority (72.0%) of the cases were treated by closed reduction. Conclusion: This study revealed Road traffic accidents (RTA) as the major etiological factor of maxillo-facial injuries, with young adult males as the main victims. The most frequent technique used was closed reduction. It is therefore recommended that there should be improved enforcement of traffic laws on motorist particularly among the young population so as to curb reckless driving and over-speeding. There should also be provision of better roads and affordable health care by the various layers of government