This book is a study of bounded weighted composite integral operators. The book is divided into five chapters and each chapter is further divided into several sections except the first chapter. The first chapter contains some introductory material. The composite integral operators are studied in the second chapter. The third chapter is devoted to a study of weighted composite integral operators. The linear and non-linear integral operator operators are reported in the fourth chapter. In the fifth chapter we characterize Frobenius-Perron operators between two Lp- spaces.