The book entitled “Fundamental Concepts Of Partial Differential Calculus” has been written to meet the requirements of the students of Degree, Honours classes of all Universities. In each chapter all concepts and definitions has been discussed in detail and lucid manner, so that the students should feel no difficulty to understand the subject. The articles have been explained in detail in a nice manner and all the examples has been completely solved. We have tried to solve each problem in an elegant and more interesting way. The students should follow the solutions very carefully and they should try to reproduce them they do the problems independently. We have tried out best to keep the book free from misprints. The authors shall be grateful to the readers who point out errors and omission which inspite of all Care, might have been there. The authors in general hope that the present book will be warmly received by the students and teachers. We shall indeed be very thankful to our colleagues for their recommending this book to their students. The authors wish to express their thanks to the publisher for the inspiration given by them to undertake and complete this project.