Marie Joseph Alfred Croiset (5 January 1845 – 7 June 1923) was a French classical philologist.
Alfred Croiset began studying classical philology at the École normale supérieure in 1864, which he graduated in 1867.
With his brother he wrote a widely read Greek literary history, which also became the basis of a manual.
His efforts to reform teaching as well as his many years of work as dean led to opposition with anti-modernist circles, who accused him of the "scientization" and "Germanization" of the humanities.
Croiset's students included Paul Mazon, Auguste Diès, and Gustave Glotz .