The present book is a compilation of various chapters of insect Ecology: The book explains about abiotic and biotic factors affecting insect activities in the diversity. The book also contains the matter related with course curriculum of post graduate and Ph.D. studies. All the chapters are simplified to make easy for the students for their study. This book is a sincere attempt to solve the problems of the students and faculties attempting to learn and teach insect ecology respectively. Non-availability of all the contents in a single book is a common problem which has incited us to collect the relevant matter and compile them into a single book designed especially for the students of insect ecology covering the syllabi of varied Universities as far as possible. The book entitled “Insect Ecology” aims at clarity each chapter to make it meaningful and easier. This text is intended to stimulate further integration of these approaches in experiments that address insect roles in agro-ecosystems.