This book of Engineering Mathematics for GATE & ESE 2023 is prepared to meet the requirement of progressive candidates appearing in GATE & ESE Prelims 2023. The book contains seven sections with a major focus on detailing questions among Linear Algebra, Calculus, Differential Equations, Complex Functions, Probability and Statistics, Numerical Methods, and Transform Theory. The book covers Topic-wise theory with Solved examples, Practice questions and Previous 32 years of solved questions of GATE & ESE Prelims of various engineering streams, viz. CE, CH, CS, EC, EE, IN, IT, PI and ME. The book is also useful for academic (undergraduate) students of engineering.