Mary Mellor (born 1946) is a British academic and activist who is Emeritus Professor in Social Science at Northumbria University, where she was the founding chair of the Sustainable Cities Research Institute. She has published widely on ecofeminism, sustainability and economics. In 2017 she was awarded the Bernardo Aguilar Award from the United States Society for Ecological Economics.

Born in Cornwall in 1946, Mellor graduated from Salford University in 1971.She went on to be awarded a PhD from Newcastle University and worked at Newcastle Polytechnic (renamed Northumbria University in 1992) as a lecturer from 1974. In 1973 she served as a Councillor (Tyne and Wear Metropolitan Council).

In 1988 Mellor was one of a group of four women who took the Department of Applied Social Sciences at Newcastle Polytechnic to an employment tribunal. The group claimed that they were discriminated against for promotion due to their gender. From 2000 to 2002 she chaired the board of Financial Inclusion Newcastle Ltd.

As of 2024, Mellor is Emeritus Professor in Social Science at Northumbria University, where she was the founding chair of the Sustainable Cities Research Institute. She has published widely on ecofeminism, sustainability and economics.

An activist, as well as an academic, Mellor participated in the protest at Greenham Common peace camp. John Barry described her as “one of the main social theorists” in the field of gender and the environment. In 2017, she was awarded the Bernardo Aguilar Award from the United States Society for Ecological Economics.