The book 'Analog Communication Systems' has been designed for the undergraduate students as well as the faculty of electrical, electronics, and communications engineering. It provides an exhaustive coverage on the fundamental concepts and recent developments in Analog Communication Systems. The book follows a bottom-up approach by building up the basic concepts of conventional modulation systems initially and then describing the latest trends in communications towards the end. It covers, after a brief introduction on the concepts of communication theory, chapters on Amplitude modulation, Angle modulation, Pulse modulation and also discusses other relevant topics. The book also provides a separate chapter on "Noise" highlights the different type of Noise encountered in Communication systems and their effect on various types of Modulation. Written in a lucid manner, the book includes a large number of circuit diagrams, worked out examples, important formulae, and questions for practice, thereby, enabling the students to have a sound grasp of the concepts presented in the book and their applications.