Ewald R. Weibel HonFRMS (born 5 March 1929) is a Swiss biologist and former director of the Institute of Anatomy at the University of Bern. He was one of the first scientists to describe the endothelial organelles Weibel-Palade bodies, which are named after him and his Romanian American colleague George Emil Palade.
Weibel was awarded the Marcel Benoist Prize in 1974. In 1981, Weibel became a foreign member of the United States National Academy of Sciences. In 2000, Weibel was elected as a foreign honorary member of the American Academy of Arts and Sciences.