Boissevain is the name of a Dutch patrician family of Huguenot origin.
The family originates from the Dordogne in France. Lucas Bouyssavy (1660–1705) appears to have been the founder of today’s Boissevain family. Lucas sold his half of the ancestral property in the village of Couze to his brother Jean on 22 July 1685. On 4 December 1687 he drew up his will in the town of Bergerac, Dordogne. Because of Catholic persecution of the Protestants, he went into exile, first to Bordeaux, and then to Amsterdam (Netherlands). He settled there in about 1691, using the name Boissevain. Thus, all bearers of the name Boissevain are necessarily descended from Boussavy.
In the course of the generations the family spread further over the rest of the Netherlands and Europe. Adolphe Boissevain (1843–1921) acquired an outstanding reputation in financing companies, particularly railway companies, e.g., the Canadian Pacific Railway. Along this line is situated, in Manitoba, the town of Boissevain, Manitoba named after Adolphe.
The investment bank owned by the family, Boissevain & Company (with offices in New York and Amsterdam) was acquired by Hallgarten & Company in January 1926. It had been in existence for around 25 years.
Daniel Boissevain (1856–1929), who turned against the family wealth and became a farmer and socialist activist in Alberta, Canada  contributed to the spread of the Boissevains over the North American continent, while Willem Frederik Lamoraal Boissevain (1852–1919) contributed to a powerful presence of the family in the Dutch East Indies (the present-day Indonesia).
Three children of Amsterdam newspaper editor Charles Boissevain (1842–1927) migrated to America. Eugen Jan Boissevain (1880–1949), an importer of coffee from Java, married two notable 20th century American women: suffragist Inez Milholland (1886–1916), for whom he emigrated to New York, and Pulitzer Prize–winning poet Edna St. Vincent Millay (1892–1950). His sister Olga Boissevain (1875–1949) married Dutch sea captain and explorer Abraham Jacob van Stockum (1864–1935). Their son, mathematician Willem Jacob van Stockum (1910–44), discovered solutions of Einstein's equations with closed timelike lines, and their daughter Hilda van Stockum (1908–2006) was a well-known artist and author of children's books.
The family websites are:
- Grain Growers Guide, accessed through the Peel's Prairie Provinces website