Achille Etna Michallon was a French painter.

Michallon was the son of the sculptor Claude Michallon and nephew of the sculptor Guillaume Francin. He studied under Jacques-Louis David and Pierre-Henri de Valenciennes. In 1817, Michallon won the inaugural Prix de Rome for landscape painting. He travelled to Italy in 1818 and remained there for over two years. This trip had a profound influence on his work. Before he had much time to develop what he had learned however, he died at the age of 25 of pneumonia, a tragedy which cut short the life of a talented and well respected artist who could have gone on to win lasting fame. Though it is often disputed, it is thought that at one time, Corot was his pupil.