Teaching all over the world is considered as one of the noblest profession. With changing current situations in teaching field, teachers are experiencing tremendous toll on their mental health. The study aimed at finding out the relationship between mental health and job stress among secondary school teachers on the basis of gender and types of school board. Methodology used was descriptive of survey type. Mental Health tool constructed by Dr. Sharma and Dr. Siddiqui was used for the research after seeking their permission. Job stress scale was constructed by the researcher. The sample size consists of 610 secondary school teachers. Data was descriptively and inferentially analysed. Mean score of Mental Health on the basis of gender revealed that female secondary school teachers are higher as compare to male secondary school teachers. Mean score of Mental Health on the basis of school board revealed that SSC board secondary school teachers is slightly higher as compare to ICSE board secondary school teachers. For job stress Mean score on the basis of gender revealed that female secondary school teachers are higher as compare to male secondary school teachers. And on the basis of types of school mean score show that of ICSE secondary school teachers is higher as compared to SSC board secondary school teachers. For the inferential analysis Pearson’s coefficient correlation test was used to find out relationship between mental health and job stress. It revealed that there is a significant relationship between Mental health and job stress of female teacher. There is however no significant relationship between mental health and job stress of male teachers. And findings also reveals that there is a significant relationship between Mental health and Job Stress of SSC and ICSE secondary school teachers. Therefore Mental Health plays an important role in reducing Job Stress.