Henri Chrétien (February 1, 1879 – February 6, 1956) was a French astronomer and an inventor.
Born in Paris, France, his most famous invention is the anamorphic widescreen process, that resulted in CinemaScope, and the co-invention (with George Willis Ritchey) of the Ritchey-Chrétien type of astronomical telescope.
He spent part of his early astronomical career at the Nice Observatory.
The astronomical Chrétien International Research Grants awards are in honor of him.