Theodoor Hendrik van de Velde (12 February 1873, Leeuwarden – 27 April 1937 near Locarno in a plane crash) was a Dutch physician and gynæcologist who served as director at the Gynæcological Institute in Haarlem.
His 1926 book Het volkomen huwelijk (The Perfect Marriage) made him an instant international celebrity.
In Germany, Die vollkommene Ehe reached its 42nd printing in 1932, in spite of the fact that it was placed on the list of forbidden books, Index Librorum Prohibitorum, by the Roman Catholic Church.
[1] In Protestant and social democratic Sweden, Det fulländade äktenskapet was widely known although regarded as pornographic and unsuitable for young readers long into the 1960s.
The English translation, Ideal Marriage: Its Physiology and Technique, was the best-known work on its subject for several decades, and was reprinted 46 times in the original edition, selling well over a half million copies.