These proceedings contain the papers presented at the ESO/IAC workshop on Quasar Hosts. They summarize the current state of research on the host galaxies of quasars and present new observations, including data from the Keck, HST, and ISO. Separate sections deal with direct observations of quasar hosts, the radio loud/quiet dichotomy, unification schemes, radio galaxies at high redshift, star formation and the interstellar medium in quasar hosts, and low redshift populations. These topics were covered in review talks, contributed talks, and poster presentations, all of which are included in this volume. This book is intended primarily for professional astronomers and students, including both observers and theorists.