Joseph Fischer, S.J. (German: Josef Fischer; 19 March 1858 – 26 October 1944) was a German clergyman and cartographer. Fischer had an eminently successful career as a cartographer, publishing old maps. In 1901, while he was investigating the Vikings' discovery of America, he accidentally discovered the long-lost map of Martin Waldseemüller, dated 1507. This map, which claims to update Ptolemy with the voyages of Amerigo Vespucci, is the first known to display the word America. The map was purchased from its owner by the United States Library of Congress in 2001 for ten million dollars.