The Proceedings of the 2003 International Symposium on Deepwater Mooring Systems: Concepts, Design, Analysis and Materials consist of 24 papers reflecting recent advances made in this field. Offshore oil and gas drilling and production activities are being pushed into deeper and deeper waters. To reduce cost while achieving high safety standards many innovative floating structure concepts are being developed and deployed. To alleviate these problems, new concepts and materials are being studied and deployed for the next generation of deepwater mooring systems. The papers represent the state-of-the-art of innovative concepts; experimental, analytical and numerical tools; and new materials used in designing a deepwater mooring system and modeling its interactions with the floating structure, anchor foundation and companying riser system. Ocean engineering professionals will find the Proceedings a valuable reference. The International Symposium was held October 2-3, 2003 in Houston, Texas, and sponsored by the Offshore Technology Research Center (OTRC) and Coasts, Oceans, Ports, and Rivers Institute (COPRI) of ASCE.