This volume contains the main papers presented at the International Conference on Analytic Tableaux and Related Methods (TABLEAUX 2000) held on July 3-7, 2000 in St Andrews, Scotland. This conference succeeded other meetings on the same topic held in Lautenbach (1992), Marseille (1993), Abingdon (1994), St Goar (1995), Terrasini (1996), Pont-' a-Mousson (1997), Oisterwijk (1998) and Saratoga Springs (1999). Tableaux and related methods, such as Gentzen calculi, are convenient and e?ective for automating deduction not just in classical logic but also in various non-standard logics. Examples taken from this meeting alone include temporal, description, non-monotonic, tense, modal, epistemic, fuzzy and intuitionistic - gics. Areas of application include veri?cation of software and computer systems, deductive databases, knowledge representation and system diagnosis. The c- ference brought together researchers interested in all aspects - theoretical fo- dations, implementation techniques, systems development, experimental com- rison and applications - of the automation of reasoning by means of tableaux or related methods.