This volume comprises refereed papers and abstracts from the 6th International Conference on the Evolution of Language (EVOLANG6). The biennial EVOLANG conference focuses on the origins and evolution of human language, and brings together researchers from many disciplines including anthropology, archaeology, artificial life, biology, cognitive science, computer science, ethology, genetics, linguistics, neuroscience, palaeontology, primatology, and psychology.The collection presents the latest theoretical, experimental and modeling research on language evolution, and includes contributions from the leading scientists in the field, including T Fitch, V Gallese, S Mithen, D Parisi, A Piazza & L Cavali Sforza, R Seyfarth & D Cheney, L Steels, L Talmy and M Tomasello.