Chintamani Kar Bird Sanctuary or Kayal-er Bagan is the only Protected Areas of West Bengal, within the city limit of Kolkata and is significant for its local floral and faunal diversity. Present communication is the first scientific study on the insect fauna of Chintamani Kar Bird Sanctuary (CKBS) and reports 215 species under 175 genera belonging to 55 families of 15 orders. Lepidoptera shares 117 species, followed by Odonata (39 species), Diptera (15 species), Hymenoptera (13 species), Coleoptera (11 species), Hemiptera (10 species), Blattodea (2 species). Beside this, Dermaptera, Ephemeroptera, Isoptera, Mantodea, Orthoptera, Phasmida, Psocoptera and Thysanura (one species each) are also enriched the insect diversity of this sanctuary. This communication also provides the present scenario of the insect faunal diversity in other protected areas of West Bengal and scope of further research.