Clemens Joseph Johannes Senefelder (April 5, 1788 - April 18, 1833) was a German lithographer, artist, and actor active in Munich in the early 19th century. Clemens was the brother and partner of Johann Alois Senefelder (1771 - 1834), inventor of lithography. As he worked extensively as a lithographer with his brother Alois, he is often erroneously assumed to be Alois' son, this is definitively not the case (c.f. CERL #cnp01380853). Many of the earliest lithographic images are attributed to Clemens, who worked hand in hand with Alois in developing the new printing technique. Alois Senefelder went on to great success, but his younger brothers and sister, also lithographers, struggled in Munich, where as late as 1799 they made ends meet by printing letter sheets which they sold in the evenings at inns. Apparently of all the Senefelder family, Clemens was the most talented artistically, producing several meticulously engraved pieces, including a large plan of Strasbourg. Later he found a job as secretary in the Ministry of Foreign Affairs. He was once taken into custody from his hotel in Vienna because of a careless public remark he made in a guest house that everything could be counterfeited, even all bills of exchange and bank notes, and so deceptively that it was impossible to distinguish fake from real. He died in Munich in 1833.