Felice Nellie Jacka OAM is an Australian academic, founder and president of the International Society for Nutritional Psychiatry Research. She is a professor of Nutritional Psychiatry and the director of the Food & Mood Centre at Deakin University.

Jacka focused her research work in the field of nutritional psychiatry, establishing diet as a risk factor and treatment target for common mental disorders. In 2017, she led a trial showing that an improved diet could treat major depression, finding that healthier eating habits can result in a 30% reduced risk of depression.

Articles in the Australian press about Jacka's studies include The Guardian, The Sydney Morning Herald and ABC News. With over 260 publications, she is an ISI Highly Cited Researcher for all years between 2020 and 2023, ranking her in the top 0.1% of publishing scientists worldwide.

In 2021 Jacka was awarded a Medal of the Order of Australia (OAM) for her service to nutritional psychiatry research.