Carl Anton Ewald (30 October 1845 – 20 September 1915) was a German gastroenterologist who was a native of Berlin.
In 1870, he earned his medical doctorate in Berlin, and subsequently became an assistant to pathologist Friedrich Theodor von Frerichs (1819–1885).
In 1888, he was appointed head physician of the department of internal medicine at Augusta Hospital in Berlin.
Carl Ewald was a pioneer in the field of gastroenterology, and was a catalyst in making Augusta Hospital a center for pathological studies of digestion.
Among his published works are "The Diseases of the Stomach" and "Lectures on Digestion", two books that have been translated into English.