Jean Mannheim was a German-born American artist and educator, known for his California Impressionist paintings. He was active in Decatur, Illinois and Pasadena, California.

Jean Mannheim was born November 18, 1863 in Bad Kreuznach in the Nahe region of Germany. He was drafted into the German Army, and eventually he fled to France. In Paris, he studied art at Académie Delécluse and Académie Colarossi, and under artists Paul-Louis Delance and William-Adolphe Bouguereau.

In 1884, he immigrated to Illinois where he taught at the Decatur Art School, some of his students in Decatur included artists Roy Brown and Charles Crocker. In the 1880s, he married Pauline McNett from the small city Mendota, but the marriage ended in divorce. In 1902, he married Eunice Drennan of Decatur, the sister of John Drennan, a longtime publisher of the Decatur Daily Review. This was followed by a two year position at Frank Brangwyn's school in London, and a stint teaching at the Denver Art School in 1903.

In 1908, Mannheim and his wife settled in Pasadena, California. In 1909, Mannheim built his house and art studio at 500 South Arroyo Boulevard, and the areas was a popular location for many of his landscape paintings. He lived nearby Ernest A. Batchelder. He was a member of the California Art Club.

In 1912, the opening of the Stickney Memorial Art School was led by Mannheim and Channel Pickering “C.P.” Townsley, which was in operation until 1934. Students of Mannheim's in Los Angeles included Marie Boening Kendall, Effie Anderson Smith, amongst others.

He died September 6, 1945 in Pasadena, California. Mannheim's great-grandson wrote a biography, From a Versatile Brush: The Life and Art of Jean Mannheim (2011).