Thora Gerda Sofie Castenschiold (1 February 1882 – 30 January 1979) was a Danish tennis player at the beginning of the 20th century.

[2] Castenschiold, a member of Copenhagen's KB, won the title at the first Danish women's tennis championships in 1906.

[3] She took part in the 1912 Summer Olympics at Stockholm and won the silver medal in the indoor singles competition.

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