The book entitled Operations Research contains eight chapters. This book is written for UG and PG students. It includes Simplex method, theory of simplex method, duality and dual simplex method. Transportation and Assignment problems. Two person zero-sum game, games with mixed strategies, graphical solution, solution by linear programming. Dynamic programming. Integer programming. Queuing theory , sequencing. Non- Linear programming- one and multi- Variable unconstrained optimization, Kuhn-Tucker conditions for constrained optimization and Quadratic programming problems.