This two-volume-set (LNCS 9573 and 9574) constitutes the refereed proceedings of the 11th International Conference of Parallel Processing and Applied Mathematics, PPAM 2015, held in Krakow, Poland, in September 2015.

The Third Workshop on Models, Algorithms, and Methodologies for Hierarchical Parallelism in New HPC Systems. Workshop on Power and Energy Aspects of Computation.- Workshop on Scheduling for Parallel Computing(SPC 2015).- The 6th Workshop on Language-Based Parallel Programming Models (WLPP 2015).- The 5th Workshop on Performance Evaluation ofParallel Applications on Large-Scale Systems.- Workshop on Parallel Computational Biology (PBC 2015).- Workshop on Applications of Parallel Computation in Industry and Engineering.- Minisymposium on HPC Applications in Physical Sciences.- The Second Workshop on Applied High Performance Numerical Algorithms in PDEs.- Minisymposium on High Performance Computing Interval Methods.- Workshop on Complex Collective Systems.- Special Session on Algorithms, Methodologies and Frameworks for HPC in Geosciences and Weather Prediction.