This undergraduate textbook is based on lectures given bythe author on the differential and integral calculus of functions of severalreal variables. The book has a modern approach and includes topics such as: *The p-norms on vector space and theirequivalence *The Weierstrass and Stone-Weierstrassapproximation theorems *The differential as a linear functional;Jacobians, Hessians, and Taylor's theorem in several variables *The Implicit Function Theorem for a system ofequations, proved via Banach's Fixed Point Theorem *Applications to Ordinary Differential Equations *Line integrals and an introduction to surfaceintegrals This book features numerous examples, detailed proofs, aswell as exercises at the end of sections. Many of the exercises have detailedsolutions, making the book suitable for self-study. Several Real Variables will be useful for undergraduatestudents in mathematics who have completed first courses in linear algebra andanalysis of one real variable.