Abstract: The effect of five organophosphorus insecticides viz., phosphamidon, quinalphos, malathion, dimethoate and diazinon were studied on the growth parameters and yield of mustard. Growth parameters such as plant height, number of branches, number of pods, number of seeds per pod, viable seeds per pod and yield were found to be increased significantly with the application of insecticides both in the field and in net house conditions. The response of quinalphos was found to be comparatively more suitable for various growth parameters and yield, followed by phosphamidon, dimethoate diazinon and malathion.