This Book Constitutes The Thoroughly Refereed Post-conference Proceedings Of The 25th International Workshop On Languages And Compilers For Parallel Computing, Lcpc 2012, Held In Tokyo, Japan, In September 2012. The 16 Revised Full Papers, 5 Poster Papers Presented With 1 Invited Talk Were Carefully Reviewed And Selected From 39 Submissions. The Focus Of The Papers Is On Following Topics: Compiling For Parallelism, Automatic Parallelization, Optimization Of Parallel Programs, Formal Analysis And Verification Of Parallel Programs, Parallel Runtime Systems, Task-parallel Libraries, Parallel Application Frameworks, Performance Analysis Tools, Debugging Tools For Parallel Programs, Parallel Algorithms And Applications.