Stanislas-Henri Rouart was a French industrialist, impressionist painter, and art collector. His son Ernest married the painter Julie Manet.

Like his brother Alexis he was a school friend of Degas, with whom he kept in touch all his life, they fought together in the war of 1870-71.

He painted under the tutelage of Millet and Corot. Between 1868 and 1872 he exhibited at the Salon. Between 1874 and 1886 he exhibited at all the Impressionist exhibitions except for the 7th, mostly watercolour landscapes from his many trips abroad. He took part in the discussions of the Impressionists and supported them financially. He was a regular host and patron to the Impressionists.