Terence Vincent Callaghan CMG (born 1945)[1] is a British biologist specialized in the ecology of the Arctic.

[2][3] He was a lead author of the IPCC Fourth Assessment Reports chapter on polar regions.

[4][5] Callaghan was born in Stockport[1] and grew up in Levenshulme in Manchester[6] and was educated at Burnage Grammar School.

[7] Callaghan's research has focussed on the arctic and subarctic environment and the ecology of plants,[8] animals, and ecosystem processes,[9][10] including ecological responses to climate change,[11][12] atmospheric carbon dioxide concentrations and UV-B radiation.

[1][13] Callaghan was awarded the Zayed International Prize for the Environment in 2007, the Vega Medal by the Swedish Society for Anthropology and Geography in 2011, the International Arctic Science Committee medal in 2017.