(Tournan-en-Brie, Seine-et-Marne, 14 March 1836 - Paris, 24 February 1911) was a French figure painter.
Lefebvre entered the École nationale superieure des Beaux-Arts in 1852 and was a pupil of Leon Cogniet. He won the prestigious Prix de Rome in 1861. Between 1855 and 1898, he exhibited 72 portraits in the Paris Salon. In 1891, he became a member of the French Academie des Beaux-Arts.
He was an instructor at the Academie Julian in Paris. He is chiefly important as an excellent and sympathetic teacher who numbered many Americans among his 1500 or more pupils. Some of his famous students were the Scottish-born landscape painter William Hart, as long as Georges Rochegrosse, Felix Vallotton, and many more. He was long a professor at the École des Beaux-Arts.
Many of his paintings are single figures of beautiful women.
Among his best portraits were those of M. L. Reynaud and the Prince Imperial (1874). Among his many decorations were a first-class medal at the Paris Exhibition of 1878 and the medal of honor in 1886. He was a Commander of the Legion of Honor and a member of the Institut de France.