The 33rd annual international Petri Net conference will take place in Hamburg from June 25th to 29th, 2012. The language of the conference is English, and its proceedings will be published by Springer-Verlag in Lecture Notes in Computer Science. All accepted papers will be considered for the "Outstanding Paper" award(s). Papers presenting original research on application or theory of Petri nets, as well as contributions addressing topics relevant to the general field of distributed and concurrent systems are sought. Topics specific to Petri Nets System design using nets Analysis and synthesis, structure and behaviour of nets Relationships between Petri Nets and other approaches Net-based semantical, logical and algebraic calculi Symbolic net representation (graphical or textual) Computer tools for nets Experience with using nets, case studies Higher-level net models Timed and stochastic nets Standardisation of nets Experience reports describing applications of nets to different kinds of systems and application fields, e.g.: flexible manufacturing systems real-time systems embedded systems defence systems biological systems health and medical systems environmental systems hardware telecommunications railway networks office automation workflows supervisory control protocols and networks Internet e-commerce and trading programming languages performance evaluation operations research General topics related to concurrency Model checking and verification of distributed systems Verification of infinite-state or parametric systems Causality/partial order theory of concurrency Educational issues related to concurrency New issues and developments in the theory of concurrency Modelling of hardware and biological systems Paper Submissions Two kinds of papers can be submitted: regular papers (max 20 pages in Springer LNCS-format) tool papers (max 10 pages in Springer LNCS-format) The website for electronical submissions is: http://www.easychair.org/conferences/?conf=petrinets2012 The full set of requirements and guidelines for submissions is given in the Call for Papers.