Ernst Burchard (September 9, 1876 – February 5, 1920) was a German physician, sexologist, and gay rights advocate and author.
Burchard was born in Heilsberg (modern Lidzbark Warmiński, Warmian-Masurian Voivodeship). He studied medicine in Tübingen, Würzburg and Kiel, taking his doctoral degree in 1900 with a dissertation on Einige Fälle von vorübergehender Glycosurie. After his studies, he worked as a physician in Berlin and opened his own practice. Here he met Dr. Magnus Hirschfeld and joined him to found the Scientific-Humanitarian Committee along with the pastor Georg Plock and Baron Hermann von Teschenberg.
Burchard, who was gay, testified as an expert witness in several court cases involving prosecutions on grounds of Paragraph 175, which criminalized homosexual practices. He and Hirschfeld co-authored several articles on sexology. In 1913, Burchard published his books Zur Psychologie der Selbstbezichtigung and Der sexuelle Infantilismus, and in 1914 he published his Lexikon des gesamten Sexuallebens. Burchard also wrote lyric poems for the gay periodicals Der Eigene and Jahrbuch für sexuelle Zwischenstufen, including the poem "Vivat Fridericus". Burchard died on February 5, 1920, in Berlin and was buried at the Luisenfriedhof cemetery.
Burchard had a successful career in medicine. After several years as a general practitioner in Berlin, he assisted Hirschfeld in starting the Scientific Humanitarian Committee with publisher Max Spohr, lawyer Eduard Oberg and writer Max von Bülow. The group aimed to undertake research to defend the rights of homosexuals and to repeal Paragraph 175, the section of the German penal code that had criminalized homosexual acts between men since 1871. They argued that the law encouraged blackmail, and the motto of the Committee, "Justice through science", reflected Hirschfeld's belief that a better scientific understanding of homosexuality would eliminate hostility toward homosexuals. Hirschfeld was a tireless campaigner and became a well-known public figure.