David Emmanuel (January 31, 1854 – February 4, 1941) was a Romanian Jewish mathematician and member of the Romanian Academy, considered to be the founder of the modern mathematics school in Romania.
He received his Ph.D. in mathematics from the University of Paris (Sorbonne) in 1879 with a thesis on Study of abelian integrals of the third species, becoming the second Romanian to have a Ph.D. in mathematics from the Sorbonne (the first one was Spiru Haret). David Emmanuel was the president of the first Romanian Congress of Mathematics held in 1929.
In 1882, David Emmanuel became a professor of superior algebra and functions theory at the Faculty of Sciences of the University of Bucharest. Here, in 1888, he held the first courses on group theory and on Galois theory. Among his students were Gheorghe Țițeica, Traian Lalescu and Simion Stoilow. Emmanuel had an important role in the introduction of modern mathematics and of the rigorous approach to mathematics in Romania.