Susan Elizabeth Anne Wijffels (born 3 August 1965) is an Australian oceanographer employed by the Commonwealth Scientific and Industrial Research Organisation (CSIRO) and based in Hobart, Tasmania.
Wijffels specialises in quantifying global ocean change over the past 50 years, including its anatomy and drivers.
She is recognised for her international and national leadership of the Global Ocean Observing System.
She is regarded as an expert in the Indonesian Throughflow and its role in global climate.