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BSPlib is a small communications library for bulk synchronous parallel (BSP) pro-gramming which consists of only 20 basic operations. This paper presents the full de nition of BSPlib in C, motivates the design of its basic operations, and gives ex-amples of their use. The library enables programming in two distinct styles: direct remote memory access using put or get operations, and bulk synchronous message passing. Currently, implementations of BSPlib exist for a variety of modern archi-tectures, including massively parallel computers with distributed memory, shared memory multiprocessors, and networks of workstations. BSPlib has been used in several scientic and industrial applications; this paper brie y describes applica-tions in benchmarking, Fast Fourier Transforms, sorting, and molecular dynamics