Charles Pierre Henri Rieu (June 8, 1820 – March 19, 1902) was a Swiss orientalist and Professor of Arabic in London and Cambridge.
He entered the British Museum in 1847, and after twenty years of service, a new post, that of Keeper of Oriental Manuscripts, was created for him.
[1] He was a Professor of Arabic and Persian at University College London.
[2] In 1895 he was made professor of Arabic in the University of Cambridge, with the full title "Sir Thomas Adams Professor of Arabic", in succession to Robertson Smith.
Rieu completed in 1871 the second part, dealing with Arabic manuscripts, of the Catalogus codicum manuscriptorum orientalium, which had been begun by William Cureton, and he issued a supplementary volume in 1894.