In recent times it has been observed that poor performance of employees at work is as a result of some form of workplace hostility such as discrimination and bullying. The study sought to examine the relationships between workplace hostility and Job performance of minorities using gender discrimination, ethnical discrimination and religious discrimination as independent variables that are exhibited by the employees of the selected Nigerian force, 222 battalion of the Nigerian army, Ughelli area command, and Nigerian Navy ship, these Nigerian law enforcement agencies was used as the case study. This study adopted a survey research design. Primary data were collected using the questionnaire. The data was analyzed using descriptive statistics while the hypothesis was tested using the Pearson product-moment correlation (PPMC) at 0.05 level of significant. The study revealed that there is significant relationship between gender, religious and ethnical discrimination and job performance of minorities(employees). It was study it was concluded that workplace hostility has negative influence on job performance of minorities. It was recommended that training programs for personnel in the Nigerian force (Army, police and navy), and enforcement of policies by the Nigerian force, so that the nefarious act of discrimination will be gradually reduced and eliminated.