Arie Bijl (Maassluis, 23 December 1908 – Hamburg-Neuengamme, 2 January 1945) was a Dutch theoretical physicist and resistance man. Arie Bijl was the youngest child of Simon Bijl (1869–1951), owner of a milk factory, and Willemijntje van der Lelij (1873–1944). Because in the Bijl family there was an eye for the extraordinary gift of Arie and his older brother Jaap (who became a pedagogue), not only the parents, but also the other children in the family contributed financially to the study of the two brothers. Arie Bijl studied mathematics and physics at Leiden University and obtained his PhD there on 28 April 1938 from Hendrik Kramers on the thesis Discontinuities in the energy and specific heat .