This book covers the importance of particle identification in particle and nuclear physics, general principles of particle identification, and discusses methods for identification of charged and neutral particles, from time-of-flight detectors, Cherenkov detectors, transition radiation detectors, muon detectors, to neutron detectors, electromagnetic calorimeters and neutrino detectors. The introductory chapters also discuss the interaction of particles with matter, and review detection methods for charged particles and gamma rays. The book includes practical examples and homework problems, and will be useful for all courses related to experimental particle and nuclear physics.