Henri Ernest Baillon was a French botanist and physician. He was born in Calais on November 30, 1827 and died in Paris on July 19, 1895.
Baillon spent his professional life as a professor of natural history, and he published numerous works on botany. He was appointed to the Légion d'honneur in 1867 and joined the Royal Society in 1894.
Baillon put together the "Dictionnaire de botanique", for which Auguste Faguet produced the wood engravings. The plant genus Baillonia was named in his honor by Henri Théophile Bocquillon.