Claes Lang (1690 – 13 July 1761) was a Finnish painter.
Lang was born in Stockholm, but his family later moved to Finland.
His father- Jochim Lang was also a painter who had lived and worked in Åland.
Artistic painter jobs do not fully employ the Lang, so he periodically had to paint houses and furniture.
He also painted murals and altarpieces at a number of churches, including in Paimion (1738), Lempäälä, Saltvik (1759), and Lumparland (1760).