Multivariable calculus is the extension of calculus in one variable to calculus in more than one variable where the differentiated and integrated functions involve multivariables rather than just one. This book is written to fulfill the needs of B.Sc. (Maths) IIIrd semester students of University of Delhi so that the students learn the concepts of calculus for the function of several variables thoroughly and apply them in new and novel ways. The theme of the book is that the Calculus is about logical thinking one cannot memorize all. The examples and exercises of the book are meticulously crafted and honed to meet the needs of the students who are keen to know about multivariable calculus. Starting from the basics of vector calculus and covering upto double and triple integrals the book provides the students a deep study of the calculus of functions of more than one variables. The book Multivariable Calculus combines in depth the theory with examples and applications of the concepts related to the functions of several variables.