This book constitutes the refereed proceedings of the 14th International Conference on Field-Programmable Logic, FPL 2003, held in Leuven, Belgium in August/September 2004. The 78 revised full papers, 45 revised short papers, and 29 poster abstracts presented together with 3 keynote contributions and 3 tutorial summaries were carefully reviewed and selected from 285 papers submitted. The papers are organized in topical sections on organic and biologic computing, security and cryptography, platform-based design, algorithms and architectures, acceleration application, architecture, physical design, arithmetic, multitasking, circuit technology, network processing, testing, applications, signal processing, computational models and compiler, dynamic reconfiguration, networks and optimisation algorithms, system-on-chip, high-speed design, image processing, network-on-chip, power-aware design, IP-based design, co-processing architectures, system level design, physical interconnect, computational models, cryptography and compression, network applications and architecture, and debugging and test.