Dame Georgina Mary Mace, (born 12 July 1953) is a British ecologist and conservation scientist.
She is Professor of Biodiversity and Ecosystems at University College London.
She was previously Professor of Conservation Science and Director of the Natural Environment Research Council (NERC) Centre for Population Biology, Imperial College London (2006–2012) and was Director of Science at the Zoological Society of London (2000–2006).