Particle physics forms an essential part of physics curriculum. This is a textbook but will also be useful for people working in this field and for nuclear physicists, particularly those who work on topics concerning interface between nuclear and particle physics. The book is designed for a semester course for senior undergraduates and a semester course for graduate students. Formal quantum field theory is not used; a knowledge of non-relativistic quantum mechanics is required for some parts of the book; but for the remaining parts the familiarity with the Dirac equation is essential. However, some of these topics are included in the appendix.