This book constitutes the refereed proceedings of the 7th International Conference on Parallel Computing Technologies, PaCT 2003, held in Novosibirsk, Russia in September 2003.The 38 revised full papers presented together with 4 invited papers and 10 poster papers were carefully reviewed and selected from 78 submissions. The papers are organized in topical sections on theory, software, applications, and tools. A broad variety of parallel processing issues and distributed computing in general are addressed.