Otto Barth
Otto Barth is the name of the following people:
- Otto Barth (medic) (1841-1919), German medic and geologist
- Otto Barth (painter) (1876–1916), Austrian painter and mountaineer
- Otto Barth (Oberamtmann) (1881–1947), Württemberg Oberamtmann
- Otto Barth (officer) (1891–1963), German major general
- Otto Wilhelm Barth (1882 – after 1930), German publisher and editor