This proceedings, ""Ocean Wave Measurement and Analysis"", consists of 180 papers presented at WAVES 2001: The Fourth International Symposium, which was held September 2-6, 2001 in San Francisco, California. It explores the major advances in wave measurement and quantification of ocean and lake waves, including technical knowledge and applications in wave theory, characteristics, design, and techniques. The topics addressed in these proceedings are national and international in scope and include practical examples and case histories on wave transformation, data analysis and reliability, wave modeling, design applications, long waves and tides, wave measurement techniques and instruments, extreme wave statistics, and other topics relating to wave research since the previous conference. The Symposium provided a forum for designers, researchers, and instrument manufacturers to discuss the latest innovations in method and measurement strategies. Anyone involved with coastal technology will find these proceedings to be a primary reference to the latest information in the field of wave measurement and analysis.