Hermann Senator (6 December 1834 – 14 July 1911) was a German internist who was a native of Gnesen in the Prussian Province of Posen (now Gniezno, Wielkopolska, Poland). Of Jewish descent, he studied medicine in Berlin, where he received his medical doctorate in 1857. Among his instructors in Berlin were Johannes Peter Müller (1801-1858), Johann Lukas Schönlein (1793-1864) and Ludwig Traube (1818-1876). In 1875, he became chief physician in the internal medicine department at the Augusta-Hospital, and in 1881 became head physician at the Berlin Charité.