Stephen J. Nicholls (born 29 May 1971) FRACP, FACC, FESC, FAHA, FAHMS, is an Australian cardiologist. He was appointed to the position of director of MonashHeart, Monash Health and professor of cardiology, Monash University in October 2018. He will be the inaugural clinical director of the Victorian Heart Hospital, due to open in late 2022. He is also the inaugural director of Monash University’s Victorian Heart Institute, an organisation dedicated to creating the cardiovascular health solutions of the future.