Message Passing is presently the most widely deployed programming model in massively parallel high performance computing. Message passing is suitable for programming a wide range of current computer architectures, ranging from multi-core desk top equipment to the fastest HPC systems in the world, offering several hundred thousand processing elements. The course is at the beginners level and assumes no prior experience in parallel computing. The concepts behind message passing and distributed memory computing will be introduced and the syntax of the key MPI calls will be explained. The course will include point-to-point communications, non-blocking communication and the collective communications calls. Practical sessions to deepen the understanding of the lectures will be part of the course. At the end of the course participants should be able to write their own MPI programs at an intermediate level. The teaching language will be English. Participants should be able to write programs in either of C or Fortran. The course will be held at PDC in Stockholm on 8-10 December 2015 All SNIC users are invited. For full information and registration visit : https://www.pdc.kth.se/events/event-repository/writing-parallel-applications-using-mpi-2015