Heinrich Ratjen (20 November 1918 – 22 April 2008), born Dora Ratjen, was a German athlete who competed for Germany in the women's high jump at the 1936 Summer Olympics at Berlin, finishing fourth, but was later discovered to be male. In some news reports, he was erroneously referred to as Hermann Ratjen and Horst Ratjen.
A file containing the findings of an investigation conducted in 1938 and 1939 into Ratjen's life was made public by Der Spiegel in 2009.
Ratjen was born in Erichshof, near Bremen, into a family described as "simple folk". The father, Heinrich Ratjen, stated in 1938: "When the child was born the midwife called over to me, 'Heini, it's a boy!' But five minutes later she said to me, 'It is a girl, after all.'" Nine months later, when the child, who had been christened Dora, was ill, a doctor examined the child's genitalia and, according to Heinrich, said "Let it be. You can't do anything about it anyway." Dora stated, also in 1938: "My parents brought me up as a girl [and] I therefore wore girl's clothes all my childhood. But from the age of 10 or 11 I started to realize I wasn't female, but male. However I never asked my parents why I had to wear women's clothes even though I was male."
In his teens, Dora began competing successfully as a girl at sports, apparently being "too embarrassed to talk about what was happening to him". In 1936, he took part in the Olympics, his teammate Gretel Bergmann stating: "I never had any suspicions, not even once... In the communal shower we wondered why she never showed herself naked. It was grotesque that someone could still be that shy at the age of 17. We just thought, 'She's strange. She's odd'... But no-one knew or noticed anything about her different sexuality." In 1938, Ratjen competed at the European Athletics Championships, and won the gold medal with a world record jump of 1.67 m (5 ft 5.75 in).
In 1939 he broke the world record in the high jump. But Dorothy Tyler-Odam was suspicious of Ratjen and, according to Odam, "They wrote to me telling me I didn't hold the record, so I wrote to them saying, 'She's not a woman, she's a man'. They did some research and found 'her' serving as a waiter called Hermann Ratjen. So I got my world record back." Odam's world record was formally recognized by the sport's world governing body, the IAAF, in 1957.