Jean Somer (fl. 1650-1663), also known as Jean Somers Pruthenus ('Pruthenus' means 'A Prussian), was a Prussian engraver active in Paris in the idle part of the 17th century. Somer worked extensively for Sanson and Mariette, for whom he was the principle map engraver. His imprint appears many of Sanson's most influential maps. Little is know of Somer's life.