Rice is very important crop in Pakistan. It is largely affected by brown leaf spot of rice in all localities. Its major impact is on grain yield. In order to assess its impact on yield and evaluate various fungicides on number of grains, 1000 grain weight, grain yield (t/h) and cost benefit ratio and their percent increase/decrease over control were recorded. A farmer field with natural disease occurrence was selected at Garhi Awan district Hafizabad, Punjab. The design applied was RCBD (Randomized Complete Block Design) . There were 6 treatments (Difenoconazole 25 EC @ 308ml/h, Azoxystrobin + Difenoconazole 325 SC @ 500ml/h, Trifloxystrobin + Tebuconazole 75WG @ 160gm/h, Thiophanate Methyl 70WP @ 750gm/h, Bismerthiazol 20WP @ 300gm/h and control) and each treatment was replicated 3 times. The fungicide combination of Azoxystrobin and Difenoconazole was found to be the most effective in yield parameters while in terms of cost benefit ratio. Thiophanate Methyl was found to be the most effective followed by the combination of Azoxystrobin + Difenoconazole.