Graham Douglas Farquhar, AO, FAA, FRS (born 8 December 1947) is an Australian biophysicist, Distinguished Professor at Australian National University,[1] and leader of the Farquhar Lab.

[3] Farquhar was appointed Professor of the Australian National University’s Research School of Biology and Chief Investigator of the Australian Research Council's Centre of Excellence for Translational Photosynthesis.

His latest project is attempting to determine which trees will grow faster in a high carbon dioxide atmosphere.

[4] In 2014 Farquhar, along with CSIRO agronomist Richard Richards, was awarded the Rank Prize in Nutrition, for "pioneering the understanding of isotope discrimination in plants and its application to breed wheat varieties that use water more efficiently", which related to a discovery the pair made in the 1980s.

[5] Farquhar was awarded the Prime Minister's Prize for Science in 2015 for his modelling of photosynthesis [6] and the Macfarlane Burnet Medal and Lecture by the Australian Academy of Science in 2016.