* 1896 – Otto Lilienthal, German engineer and aviation pioneer ( b. 1848 )

* 2003 – Otto Graham, American football player ( b. 1921 )

* 1938 – Otto Bauer, Austrian politician ( b. 1881 )

* 2011 – Otto von Habsburg, Austrian-Hungarian prince ( b. 1912 )

* 973 – Otto I, Holy Roman Emperor ( b. 912 )

* 1967 – W. Otto Miessner, American composer and educator ( b. 1880 )

* 1934 – Otto Hermann Kahn, German investment banker, collector and philanthropist ( b. 1867 )

* 1944 – Otto Blumenthal, German mathematician ( b. 1876 )

* October 6 – Otto Fritz Meyerhof, German-born physician and biochemist, recipient of the Nobel Prize in Physiology or Medicine ( b. 1884 )

* August 5 – Heinrich Otto Wieland, German chemist, Nobel Prize laureate ( b. 1877 )

* February 26 – Otto Wallach, German chemist, Nobel Prize laureate ( b. 1847 )

* July 25 – Otto Dix, German painter ( b. 1891 )

** Otto Stern, German physicist, Nobel Prize laureate ( b. 1888 )

* October 4 – Natalino Otto, Italian singer ( b. 1912 )

* January 14 – Otto Liebmann, German philosopher ( Kant & Epigones ) ( b. 1840 ).

* December 23 – Otto Schoetensack, German anthropologist ( b. 1850 )

* December 22 – Otto Neurath, Austrian philosopher and political economist ( b. 1892 )

* April 14 – Otto Dowling, United States Navy Captain, and the 25th Governor of American Samoa ( b. 1881 )

* October 4 – Otto Weininger, Austrian-Jewish author ( b. 1880 )

** Otto Harbach, American lyricist and librettist ( b. 1873 )

** Otto Struve, Russian – American astronomer ( b. 1897 )

* August 27 – Otto Strasser, Nazi German politician ( b. 1897 )

* July 28 – Otto Hahn, German chemist, discoverer of nuclear fission, Nobel Prize laureate ( b. 1879 )

* December 25 – Otto Loewi, German-born pharmacologist, recipient of the Nobel Prize in Physiology or Medicine ( b. 1873 )

** Otto Tief, Estonian politician and military commander ( b. 1889 )

* Otto, J. C., Jena, 1842 ( 3d ed., 1876 – 1881 ).

* June 9 – Adolf Otto Reinhold Windaus, German chemist, Nobel Prize laureate ( b. 1876 )

In 1876, Nikolaus Otto patented the Otto cycle engine.

The earliest of these to be developed is the Otto cycle engine developed in 1876 by Nikolaus August Otto in Cologne, Germany, after the operation principle described by Alphonse Beau de Rochas in 1861.

The Otto cycle is named after the 1876 engine of Nikolaus A. Otto, who built a successful four-cycle engine based on the work of Jean Joseph Etienne Lenoir.

By 1876, Otto and Langen succeeded in creating the first internal combustion engine that compressed the fuel mixture prior to combustion for far higher efficiency than any engine created to this time.

The diesel engine is a technical refinement of the 1876 Otto Cycle engine.

The Lenoir, Otto Atmospheric, and Otto Compression engines ( both 1861 and 1876 ) were designed to run on Illuminating Gas ( coal gas ).

In 1876, Otto Mittelstädt presented evidence against this theory based on the official documents about the prince's emergency baptism, autopsy and burial.

In 1876, Otto invented the four-stroke cycle, also known as the Otto Cycle, a system characterized by four piston strokes ( intake, compression, power, and exhaust ).

* Gefangene Vögel, with Otto Finsch ( 2 vols., 1872 – 1876, pub.

* 1876 – 1878 — Franz Otto Theodor von Hoffmann

Max Otto Lorenz ( September 19, 1876 in Burlington, IowaJuly 1, 1959 in Sunnyvale, California ) was an American economist who developed the Lorenz curve in 1905 to describe income inequalities.

** Otto Diels ( born 1876 ), German Nobel Chemistry laureate, 1950.

* Notitia dignitatum: accedunt Notitia urbis Constantinopolitanae et Laterculi provinciarum, edidit Otto Seeck, Berolini: Weidmann, 1876.

* Adolf Otto Reinhold Windaus ( 1876 – 1959 ), chemist, Nobel laureate

It was distinguished from the German Conservative Party established in 1876 by its unqualified support of German unification, and was seen as the political party which beside the National Liberals was closest in views to those of Chancellor Otto von Bismarck, including his Anti-Socialist Laws and Kulturkampf policies.

Adolf Otto Reinhold Windaus ( 25 December 1876 – 9 June 1959 ) was a German chemist who won a Nobel Prize in Chemistry in 1928 for his work on sterols and their relation to vitamins.