Henri Julien Felix Rousseau (May 21, 1844 - September 2, 1910) was a French Post-Impressionist painter in the Naive or Primitive manner. He is also known as Le Douanier (the customs officer) after his place of employment. Ridiculed during his life, he came to be recognized as a self-taught genius whose works are of high artistic quality.

He was born in Laval in the Loire Valley into the family of a plumber. He attended Laval High School as a day student and then as a boarder, after his father became a debtor and his parents had to leave the town upon the seizure of their house. He was mediocre in some subjects at the high school but won prizes for drawing and music. He worked for a lawyer and studied law, but "attempted a small perjury and sought refuge in the army," serving for four years, starting in 1863.