Adrien Frédéric Jules Dollfus (21 March 1858, in Mulhouse-Dornach – 19 November 1921, in Paris) was a French carcinologist known for his work with terrestrial isopods, including crustaceans and trilobites.
He was born in Dornach, Alsace, now part of the city of Mulhouse, Haut-Rhin.
He completed a Bachelor of Science degree and then began a lifelong study of crustaceans and trilobites.
In 1870 he founded the publication La Feuille des jeunes naturalistes.
In 1912 Dollfus was chosen president of the Société zoologique de France.