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 the application, implementation, and theory of automata and related structures. This year, six additional papers were selected as short papers , at the conference these were allocated the same presentation length as r- ular papers. Each paper was reviewed by at least three Program Committee members, with the assistance of external referees. Papers were submitted by - thors from the following countries: Australia, Austria, Belgium, Brazil, Canada, China, Czech Republic, Finland, France, Germany, India, Italy, Republic of - rea,Japan,Latvia,TheNetherlands,Portugal,RussianFederation,Spain,South Africa, Turkey, United Arab Emirates, and the USA.