Bryan Foss Leach CNZM (born 1942) is a New Zealand archaeologist and a pioneer of integrated regional research programmes, conservation of archaeological materials, zooarchaeology, and broader aspects of archaeological science. He has been a strong advocate of collaborative cross-disciplinary research. Leach has served as an officer and committee member of numerous New Zealand and international organisations concerned with archaeology and cultural heritage management, and has held honorary fellowships in various institutions.