Catriona M. O. Macinnis-Ng is a New Zealand ecologist, and is a full professor at the University of Auckland, specialising in the effects of climate change, especially drought, on plants.

[4][5] Macinnis-Ng also mentors within the University of Auckland's Women in Science Programme, and serves on the Royal Society Te Apārangi Council.

[5][6] Macinnis-Ng is a principal investigator in the Te Pūnaha Matatini Centre of Research Excellence.

[4] She was awarded a Marsden Fast-Start Grant in 2012 to research the ecophysiology of kauri trees, with respect to possible effects of drought and climate change.

[2] She was awarded a Rutherford Discovery Fellowship in 2015 to research the impact of drought on native forest ecosystems.