Gustavo Turecki (born May 11, 1965) is a Canadian psychiatrist, suicidologist, neuroscientist who is a professor at McGill University in Montreal, Quebec, Canada.

He has published over 500 peer-reviewed publications and 30 book chapters[8] examining the influence of life experiences on brain function and their relationship to depression and suicide risk.

One of his major contributions is the first description of the long-term impact of childhood abuse on the brain, particularly how it affects the activity of key genes involved in the stress response.

In collaboration with Michael Meaney and Moshe Szyf, Turecki uncovered that early-life adversity epigenetically regulates the glucocorticoid receptor gene, a key component of response to stress.

Turecki's further research on the human brain explored the epigenetic control of genes related to stress-response systems, such as the hypothalamic-pituitary-adrenal (HPA) axis, particularly in association with childhood abuse and suicide.