Johann Constantin August Lucae (August 24, 1835 – March 17, 1911) was a German otologist who was a native of Berlin. He studied medicine in Berlin and Bonn, and in 1859 earned his doctorate. He furthered his studies in London with Joseph Toynbee (1815–1866), later returning to Berlin, where he worked in Virchow's pathological institute. In 1871 he became an associate professor, and in 1874 was appointed director of the university policlinic for ear diseases. In 1899 Lucae became a full professor of otology at the University of Berlin.