Jacqueline Sara Rowarth CNZM (born 1956) is a New Zealand and British agronomist, dairy farmer and science administrator.

[5] She moved to New Zealand in 1976 and has an Agricultural Science degree with first-class honours in Environmental Agriculture, and obtained a PhD in Soil science from Massey University, with a 1987 thesis titled Phosphate cycling in grazed hill-country pasture.

[8] In October 2016 Rowarth left Waikato to become the first Chief Scientist of the Environmental Protection Authority.

It was later revealed that the EPA was warned her behaviour was damaging trust in the organisation, apparently due to comments to the media about environmentalist concerns that she deemed unwarranted.

She has argued that a vegan diet will not save the planet from climate change and has also argued that an omnivorous diet including a moderate amount of dairy products and meat delivers the required nutrients per person for least environmental impact.