Gerard Lucasz or Gerrit van Schagen or van Schaagen; Latin: Gerardus a Schagen (ca. 1642 - after 1690) was a cartographer from Amsterdam; well known for his maps.

He lived and worked in Amsterdam; in the Haarlemmerstraat near the New Haarlem sluice. He was last mentioned at the burial of his wife Gertruij Govers van Schendel/Schijndel in the Nieuwezijds Kapel on September 29; 1690. Pictures From History