Carl Ulrich Franz Mannich (March 8, 1877 in Breslau – March 5, 1947 in Karlsruhe) was a German chemist.
From 1927 to 1943 he was professor for pharmaceutical chemistry at the University of Berlin.
His areas of expertise were keto bases, alcohol bases, derivatives of piperidine, papaverine, lactones and also Digitalis-glycosides.
The Mannich reaction was named after his discovery of the mechanism in 1912.