Similarity Based Pattern Recognition : First International Workshop SIMBAD 2011 Venice Italy September 28 30 2011. Proceedings This book constitutes the proceedings of the First International Workshop on Similarity Based Pattern Recognition SIMBAD 2011 held in Venice Italy in September 2011. The 16 full papers and 7 poster papers presented were carefully reviewed and selected from 35 submissions. The contributions are organized in topical sections on dissimilarity characterization and analysis; generative models of similarity data; graph based and relational models; clustering and dissimilarity data; applications; spectral methods and embedding.