List of Famous people named Otto

Otto Meyer (1901–1980) was an American film editor.

Otto Kitzler was a German cellist and conductor. He is noted for being the form and orchestration teacher of the Austrian composer Anton Bruckner from 1861 to 1863.

Otto Julius Bierbaum was a German writer.

Otto Richard Lummer was a German physicist and researcher. He was born in the city of Gera, Germany. With Leon Arons, Lummer helped to design and build the Arons–Lummer mercury-vapor lamp. Lummer primarily worked in the field of optics and thermal radiation. Lummer's findings, along with others, on black body radiators led Max Planck to reconcile his earlier Planck's law of black-body radiation by introducing the quantum hypothesis in 1900. In 1903, with Ernst Gehrcke, he developed the Lummer–Gehrcke interferometer. Lummer died in former Breslau, now Wrocław.

Otto Brahm was a German drama and literary critic, theatre manager and director. His productions were noted for being accurate and realistic. He was involved in the foundation of the progressive Die Freie Bühne company, of which he became president and producer. He also edited the company's weekly magazine of the same name, but later changed its name to Die neue Rundschau.