John William Zillman AO (born 28 July 1939) is an Australian meteorologist, and former President of the World Meteorological Organization and the Australian Academy of Technological Sciences and Engineering (ATSE). He was born and was educated in Brisbane, Queensland. Through his leadership in professional organizations and advisory groups, Zillman has contributed to shaping science and innovation policy in Australia. More widely, he has contributed to raising awareness to the consequences of global climate change through involvement in the Intergovernmental Panel on Climate Change (IPCC).