This book “Group Theory” has been written for the students of B.A/B.Sc., students. This book is also helpful to the candidate appearing in various competitions like pre Engineering/I.A.S/P.C.S etc. The book contains: Groups, Homomorphism and Isomorphism, Subgroups of a Group, Permutation, and Normal Subgroups. The proofs of various theorems and examples have been given minute deals each chapter of this book contains complete theory and fairly large number of solved examples.