Lars Wallentin (born 1943) is a Swedish physician and cardiologist. In 1998 he was the first recipient of the Nordic Medical Prize, the second largest medical award in the Nordic countries. He was elected as a member of the Royal Swedish Academy of Sciences in 2007. He has been described by the European Heart Journal as "an international superstar cardiologist."
He holds a doctorate in medicine from Linköping University in 1976 and is a full professor of cardiology at Uppsala University. He is one of the world's leading experts on unstable coronary artery disease, and one of the most highly cited cardiologists overall.