This volume contains the Proceedings of the fifth SLAC Summer Institute on Particle Physics held at the Stanford Linear Accelerator Center July 11-22, 1977. The topic for this year's Institute, "Quark Spectroscopy and Hadron Dynamics," was covered by usage .of the format of previous years with a one-week long intense, pedagogic review of the material followed by a three-day topical conference. The Institute was attended by 317 physicists from 18 countries.