**Hendrik Jan Maarten** "**Henk**" **Bos** (born 17 July 1940, Enschede) is a Dutch historian of mathematics.

Hendrik was a student of Hans Freudenthal and Jerome Ravetz at Utrecht University and in 1973 wrote a thesis "Differentials, higher order differentials, and the derivative in Liebnitzian calculus" for his doctorate.

Bos worked at Utrecht University for most of his career. In 1985 he became professor of history of mathematics.

He took an interest in the tractrix as a mathematical stimulus.

Bos retired in 2005. Since his retirement he has been honorary professor of the history of mathematics at the Faculty of Science at the University of Aarhus. He is married to Kirsti Andersen.

At his Valedictory Symposium when he retired, Henk spoke on fluid concepts in mathematics in a talk titled "Loose Ends". He was awarded the Kenneth O. May Medal for 2005.

Bos has contributed to the study of the mathematical works of the seventeenth-century philosopher René Descartes, including Descartes’ contribution to the development of algebra and geometry.

1974: "Differentials, higher-order differentials and the derivative in the Leibnizian calculus", Archive for History of Exact Sciences 14: 1–90, doi:10.1007/BF00327456
1980: "Newton, Leibnitz and the Leibnizian tradition", chapter 2, pages 49–93, in *From the Calculus to Set Theory, 1630 – 1910: An Introductory History*, edited by Ivor Grattan-Guinness, Duckworth ISBN 0-7156-1295-6
1981: (with Herbert Mehrtens & Ivo Schneider) "Mathematics and Revolution from Lacroix to Cauchy", pages 50–71 in *Social History of Nineteenth Century Mathematics*, Birkhäuser ISBN 978-0-8176-3033-1
1984: "The closure theorem of Poncelet", Rend. Sem. Mat. Fis. Milano 54, 145–158 (1987).
1987: (with Kers, C.; Oort, F.; Raven, D. W.) "Poncelet's closure theorem", Exposition. Math. 5 no. 4, 289–364.
1993: *Lectures in the history of mathematics*, History of Mathematics, 7. American Mathematical Society, Providence, RI; London Mathematical Society, London.
2001: *Redefining geometrical exactness. Descartes' transformation of the early modern concept of construction*, Sources and Studies in the History of Mathematics and Physical Sciences. Springer-Verlag, New York.