Carl Stefan Bennet was a Swedish baron, cartoonist, landscape and history painter. He became a member of the Royal Academy of Fine Arts in 1840 and was appointed royal court painter in 1844.

Carl Stefan Bennet was the son of the court marshal Baron Carl Fredrik Bennet and Baroness Fredrika Magdalena Thott. He began a military career and became a cadet in 1817, He became a lieutenant in 1825.

Bennet received his artistic education during a trip to Italy 1829-1832 where he stayed in Rome and Naples. His closest contact in Rome was with the sculptors Bengt Erland Fogelberg and Bertel Thorvaldsen and the French painter Horace Vernet. After returning to Sweden, he divided his time between military service and art. During the annual recurring few weeks of military service in the 1830s, he drew a series of camp life scenes which he published as lithographs in the small album Croquier collected during the camp in 1836 by an amateur.

In 1838 he resigned from the military, after advancing to captain, and conducted preparatory studies in the field of art in Sweden. He then painted mostly Italian landscape motifs, Stockholm views and views of larger mansions, but also portraits, animal pictures and cartoon architectural motifs. In the field of history painting, he later performed, among other things, Revue at Ladugårdsgärdet and the Unveiling of Carl XIV Johan's statue equestre, with a number of famous portrait figures. In 1845 he also visited Paris for study purposes.

He became a member of the Royal Academy of Fine Arts in 1840 and was appointed royal court painter in 1844. In 1858 he was governor of Stockholm Castle for two months and he appears with Mauritz Klingspor in Hector Berlioz's memoirs.