François Nau (13 May 1864 at Thil – 2 September 1931 at Paris) was a French Catholic priest, mathematician, Syriacist, and specialist in oriental languages.
In 1895 he gained the diploma of the École pratique des hautes études in Paris by publishing the Syriac text and a French translation of a treatise on astronomy by Bar Hebraeus.
In 1899, together with René Graffin (1858–1941) he founded the series Patrologia Orientalis, intended to complement the Greek and Latin patrologies of Migne.
Starting in 1890, Nau taught mathematics and astronomy for 40 years at the Institut Catholique de Paris.
A complete list of Nau's publications can be found in an appendix to the article by Brière, Journal Asiatique n° 233, pages 153-180 1st thesis: Formation et extinction du clapotis.