Carl Marcus Tuscher (1 June 1705 in Nuremberg – 6 January 1751 in Copenhagen) was a German-born Danish polymath: portrait painter, printmaker, architect, and decorator of the Baroque period.

Stosch, who was also a British spy, for political reason had to flee from the Papal States to Florence in 1734, taking refuge under the tolerant rule of Gian Gastone de' Medici.

In November 1743 he moved to Copenhagen, where he was made court painter and royal architect invited by King Christian VI and had the counts Danneskiold-Samsøe as his benefactors.

In 1748 he made a large plafond portrait of King Christian VI on horseback, surrounded by allegorical figures; it was destroyed when the castle burned in 1794.

Among his main surviving paintings are full portraits of Count Johan Ludvig Holstein and his brothers in the great hall at Ledreborg manor.

The monument shows Tuscher's familiarity with the Italian Baroque art and a strong affinity with Bernini's fountains and sculpture sets in Rome.

Marcus Tuscher died after a long illness on 6 January 1751 under the reign of Frederik V and was buried at Vor Frelsers Kirke (Our Saviour's Church) in Copenhagen.