Oskar Kellner

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Oskar (Oscar) Johann Kellner (13 May 1851, Tillowitz, Upper Silesia - 12 September 1911, Karlsruhe) was a German agricultural scientist (Agrikulturchemiker, Tierphysiologe).

Oskar Kellner was invited to teach in Japan as a foreign advisor in 1881. He taught at the Komaba Agricultural School in Tokyo, and its successor, the Tokyo Agriculture and Forestry School (now a department within Tokyo University), and also conducted research into fertilizers. He is considered the “father” of Japanese agricultural chemistry. His nutritional analysis of livestock feed was called the “Kellner standard” and was subsequently adopted by the Japanese livestock industry. He returned to Germany in 1892.