The present experiment was conducted to record the occurrence of insect pests and coccinellid predators on mustard crop ecosystem during rabi season 2021-22 and 2022-23 at Technological Park, Sardar Vallabh bhai Patel University of Agriculture and Technology, Modi Puram, Uttar Pradesh. Total five major insect pests and different species of coccinellids were found associated with the mustard crop. Mustard sawfly, Painted bugs, Green stink bugs appeared during the early stages (48th SW to till 5th SW) and disappeared in the later part of the crop period. Cabbage butterfly was observed in the middle of the crop period (3rd to 11 SW). Mustard aphid and coccinellids were associated largely with the mustard crop i.e, from 48th SW to till harvest of the crop. Correlation studies revealed that the temperature and relative humidity are the two most important weather parameters that influence the insect pests and coccinellid population of mustard crop ecosystem.