Sundarbans, the largest single continuous tract of natural mangroves in the world, is endowed with a diverse group of plants and animals and has recently been given the status of ‘World Heritage Site’ by the UNESCO.Thispaper gives a briefaccount of 31 species of insect pests attacking Sundarbans mangroves of Bangladesh. The pests include five species of defoliators, three stem borers, eight fruit borers, two gall makers, one sap sucker, one root feeder and 11 wood borers. These include 17 specks of Coleoptera, 11 species of Lepidoptera, two species of Diptera and one species of Homoptera.