Marga Boodts (February 18, 1895 - October 13, 1976) was a woman who claimed to be Grand Duchess Olga Nikolaevna of Russia. She was one of a considerable number of Romanov pretenders who emerged from various parts of the world following the execution of Tsar Nicholas II and his family at Yekaterinberg on July 18, 1918. She stands out, however, as one of very few who claimed to have been Grand Duchess Olga, the Tsar's oldest daughter. She was also known as Maria Bottcher.
By her own account, Marga Boodts survived the execution at Yekaterinberg when a member of the firing squad, whom she identified only as Dimitri K., knocked her unconscious and pretended that she was dead. Dimitri K., who had been a Cossack soldier, replaced her missing corpse with that of a young woman who had been caught stealing from the bodies of the other members of the Imperial family. He later accompanied her to Vladivostok. Boodts claimed that upon her arrival to Vladivostok she was received by a German elite commando, and from Vladivostok, she reputedly said to have traveled through China and later she was taken by sea to Germany.
Boodts took her surname from Carlo Boodts, a German officer whom she married in Berlin on May 5, 1926 and divorced two years later. It was also while living in Germany that she claimed to have traveled to Doorn, the Netherlands, and visited Kaiser Wilhelm II (1859–1941), who recognized her as Grand Duchess Olga Nikolaevna. He apparently provided her with financial support for the remainder of his lifetime. She recalled that she had also promised the former Kaiser that she would never reveal her Imperial identity, and would "keep the secret of my survival throughout my life". According to Boodts, the former Kaiser choose the daughter of a friend, Baroness Elisabeth von Schevenbach, to pick her up upon her arrival to Hamburg, and asked her to take care and provide Mrs. Boodts with accommodation. Boodts lived with Frau von Schevenbach for a few years at Potsdam, and later moved to Berlin. She also lived in a state near Stralsund, in eastern Germany.
Boodts' claim gained further credence from 1957, when she was recognised by Prince Sigismund of Prussia (1896–1978), who was a first cousin of the actual Grand Duchess Olga. He, in turn, introduced Boodts to Nikolaus, Hereditary Grand Duke of Oldenburg (1897–1970), a godson of Tsar Nicholas II, who provided her with financial support until his own death in 1970. In 1974, Prince Sigismund remained convinced of Boodts' authenticity. As he told journalists Anthony Summers and Tom Mangold, "we spoke about so many familiar matters that an outsider could not have known about, because they were things that had happened between us two". They maintained correspondence until 1976 when she died. There are 530 letters kept in a private archive in Italy as evidence of that relation. In 1958 Princess Charlotte Agnes of Saxe-Altenburg also visited Marga Boodts, together with her brother Prince Frederick Ernst of Saxe-Altenburg. Prince Sigismund and Princess Charlotte both provided affidavits that the woman living at Lake Como was indeed Grand Duchess Olga Nikolaevna of Russia. During that period, Boodts is also said to have received financial support from Pope Pius XII.