This book constitutes the refereed proceedings of the 9th International Conference on Unconventional Computation, UC 2010, held in Tokyo, Japan, in June 2010. The 15 revised full papers presented together with 4 extended abstracts of invited talks, and 8 abstracts of posters were carefully reviewed and selected from numerous submissions. The papers are devoted to all aspects of unconventional computation — theory as well as experiments and applications. Typical topics are: natural computing including quantum, cellular, molecular, membrane, neural, and evolutionary computing, as well as chaos and dynamical system-based computing, and various proposals for computational mechanisms that go beyond the Turing model.