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Castrén is the surname of a Finnish family. Notable members include:

Aarne Castrén (1923–1997), Finnish Olympic sailor
Arthur Castrén (1866–1946), Finnish politician
Garth Castrén (born 1939), Finnish diplomat
Inga-Brita Castrén (1919–2003), Finnish theologian
Jalmar Castrén (1873–1946), Finnish politician
Jonas Castrén (1850–1922), Finnish lawyer and politician
Kaarlo Castrén (1860–1938), Finnish lawyer and politician, briefly Prime Minister of Finland
Klaus Castrén (1923–2011), Finnish diplomat
Matthias Castrén (1813–1852), Finnish ethnologist and philologist
Matilda Castren (born 1995), Finnish professional golfer
Mauno Castrén (1931–2021), Finnish diplomat
Natalia Castrén (1830–1881), Finnish culture personality and salon hostess
Urho Castrén (1886–1965), President of the Supreme Administrative Court of Finland, briefly Prime Minister of Finland

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