Joseph Emanuel Fischer von Erlach, also Fischer von Erlach the Younger (13 September 1693 in Vienna – 29 June 1742 in Vienna) was an Austrian architect of the Baroque, Rococo, and Baroque-Neoclassical.
Joseph Emanuel was the son of Johann Bernhard Fischer von Erlach. He first developed his skills in his father's workshop. In 1711, he worked on several of his father's commissions (e.g. Palais Dietrichstein, Palais Trautson, Bohemian Court Chancellery, Schwarzenberg Palace) and also helped complete the publication "Draft of a historical architecture"; whose four volumes inspired many later designs. Through this work, Joseph Emanuel came into contact both with the architecture of his and earlier times and with Berne, his father's noble order.
His father also involved Joseph Emanuel in the writing of "Folders and Outlines of some buildings of Vienna, self-drawn from J.E.F.v.E.," with a preface by the court antiquarian Carl Gustav Heraeus. This publication was resumed later by Salomon Kleiner.
Until 1714, he received instruction in Vienna from his father's guest Gottfried Leibniz. The two obtained a travel scholarship for Joseph Emanuel from Kaiser Karl VI. This led him in 1713/1714 to Italy, where he accompanied, among others, the well-known archaeologist Francesco de Ficoroni.
From 1717 to 1719, he was in France with the French court master-builder Robert de Cotte, the architect Germain Boffrand, and with the philologist Bernard de Montfaucon. He also spent time in Leyden and London, where he studied the re-invented Steam engines and possibly also met Isaac Newton.
In 1722 he returned to Vienna. He sought and obtained (in December 1722) a court architect position where he also exercised his considerable technical abilities, building the first steam engine in continental Europe (at Schwarzenberg Palace) during the same year. After the death of his father 1723, Johann Lucas von Hildebrandt succeeded to the position of chief Court Architect.