This book constitutes the refereed proceedings of the 14th International Conference on
Foundations of Software Science and computational Structures FOSSACS 2011 held in Saarbrücken
Germany March 26-April 3 2011 as part of ETAPS 2011 the European Joint Conferences on
Theory and Practice of Software. The 30 revised full papers presented together with one
full-paper length invited talk were carefully reviewed and selected from 100 submissions. The
papers are organized in topical sections on coalgebra and computability type theory process
calculi automata theory semantics binding security and program analysis.