The book is unique in the sense that it presents a complete coverage of material required for one semestercourse on dynamics of structures in a single volume. Students need not search several books for theirrequirements. Initially basic concepts such as theory of vibration dynamics of structures fundamentals ofearthquake engineering effect of damping etc. for a single degree of freedom system have been presentedto help the students to acquaint with the subject. The materials have been presented in a simple languagewhich the students can follow easily and assimilate the contents without much difficulty. Starting fromfundamentals the book gradually builds up multi-degree of freedom system giving initially details aboutformulation of equation decoupling of the equations modal analysis solution of MDOF equations todetermine the properties of individual DOF system.