This study examines the contribution of conflict management on employee’s performance in Tanzania with particular reference to Dar es Salaam Maritime Gateway Project (DMGP). Specifically, the study intended to examine the nature of communication flow at DMGP, to identify the conflict resolution approaches practiced at DMGP and to associate practiced conflict resolution approaches with employees’ performance in Dar es Salaam Maritime Gateway Project. The study adopted the use of case study research design in generating the required primary data and was limited to the employees of DMGP. The study involved 45 technical employees who were conveniently and purposively selected for inclusion in the sample. Collected data was coded then analyzed with the help of SPSS version 23. Findings revealed that employees fear to speak out their inner concerns to supervisors because of insecurity of their job despite having a chance to express their opinions. Results have also indicated that interpersonal conflicts were predom