Jaenisch is a surname. Notable people with the surname include:
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Carl Jaenisch
Carl Ferdinand von Jaenisch (russian: Карл Андреевич Яниш, ''Karl Andreyevich Yanish''; April 11, 1813 – March 7, 1872) was a Finnish and Russian chess player and theorist. In the 1840s, he was among the top players in the ...
(1813–1872), Finnish and Russian chess player
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Rudolf Jaenisch (born 1942), German cell biologist
Surnames from given names
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