Hendricus Gerardus van de Sande Bakhuyzen (April 2, 1838, in The Hague – January 8, 1923, in Leiden) was a Dutch astronomer.
After he got his degree, he was a high school teacher from 1864–1867, during which time he wrote a very successful textbook on mechanics.
[1] Van de Sande Bakhuyzen became member of the Royal Netherlands Academy of Arts and Sciences in 1872.
He worked mainly on the observation of asteroids, but also proved the connection between a meteor shower on November 27 and the comet 3D/Biela.
His brother Ernest-Frederich van de Sande Bakhuyzen was also an astronomer who worked at the Leiden Observatory.