Caspar Ritter (7 February 1861, Esslingen am Neckar - 18 July 1923, Ermatingen) was a Swiss portrait painter; primarily of women.
He was the second of eight children born to Johann Ulrich Ritter, a spinning mill director who was originally from Switzerland.
He soon developed health problems, which gave him an opportunity to express his preference for a career in art.
The following year, they moved to Frankfurt, where he became a teacher of figure painting at the Städel Art Institute.
He was there for only a year, when Grand Duke Friedrich I appointed him Professor of portrait painting at the Academy of Fine Arts, Karlsruhe.