Johann Decker
Johann Decker is the name of the following people:
- Johann Decker (politician) (1822–1873), German politician (center), MdR
- Johann Decker-Schenk (1826–1899), Austrian guitarist, singer and composer
- Johann Jakob Decker (1635–1697), Swiss printer
- Johann Stephan Decker (1783–1844), painter and lithographer
