The 14th International Conference on Implementation and Application of - tomata (CIAA 2009) was held in NICTA¿s Neville Roach Laboratory at the University of New South Wales, Sydney, Australia during July 14¿17, 2009. This volume of Lecture Notes in Computer Science contains the papers that were presented at CIAA 2009, as well as abstracts of the posters and short papers that were presented at the conference. The volume also includes papers orextendedabstractsofthethreeinvitedtalkspresentedbyGonzalo Navarro on ImplementationandApplicationofAutomatainStringProcessing,byChristoph Koch on Applications of Automata in XML Processing,and by Helmut Seidl on Program Analysis Through Finite Tree Automata. The 23 regular papers were selected from 42 submissions covering various ?elds in