This book constitutes the refereed proceedings of the 6th International Conference on Text, Speech and Dialogue, TSD 2003, held in Ceské Budejovice, Czech Republic in September 2003. The 60 revised full papers presented together with 2 invited contributions were carefully reviewed and selected from 121 submissions. The papers present a wealth of state-of-the-art research and development results in the field of natural language processing with an emphasis on text, speech, and spoken language ranging from theoretical and methodological issues to applications in various fields, such as web information retrieval, the semantic web, algorithmic learning, and dialogue systems.