QSO Absorption Lines : Proceedings of the ESO Workshop Held at Garching Germany 21 24 November 1994 These proceedings contain the papers presented at the ESO workshop on QSO Absorption Lines . The papers summarize the current state of understanding and review the new observations especially from HST and Keck as well as the theoretical insights. The different sections address the following topics: damped Lyman alpha systems abundances absorption lines from gas in our Galaxy metal rich systems at low and intermediate redshifts BAL QSOs and quasar environment Lyman alpha systems at low and high redshifts large scale structure the UV background and formation of absorbing systems. The book is meant for graduate students and researchers