The purpose of the CONCUR conferences is to bring together researchers, developers, and students in order to advance the theory of concurrency, and promote its applications. CONCUR is co-located with: - the 17th International Conference on Formal Modelling and Analysis of Timed Systems (FORMATS 2019) - the Combined 26th International Workshop on Expressiveness in Concurrency and 16th Workshop on Structural Operational Semantics (EXPRESS/SOS 2019) - the 8th IFIP WG 1.8 Workshop on Trends in Concurrency Theory (TRENDS 2019) - the 4th International workshop on TIming Performance engineering for Safety critical systems (TIPS 2019) - the 9th Young Researchers Workshop on Concurrency Theory (YR-CONCUR 2019) CONCUR 2019 solicits high quality papers reporting research results and/or experience related to semantics, logics, verification and analysis of concurrent systems. All papers must be original, unpublished, and not submitted for publication elsewhere.