Emmanuel Louis Masqueray (1861–1917) was a Franco-American preeminent figure in the history of American architecture, both as a gifted designer of landmark buildings and as an influential teacher of the profession of architecture dedicated to the principles of Beaux-Arts architecture.

Beaux-Arts architecture was the academic architectural style taught at the École des Beaux-Arts in Paris, particularly from the 1830s to the end of the 19th century. It drew upon the principles of French neoclassicism, but also incorporated Renaissance and Baroque elements, and used modern materials, such as iron and glass, and later, steel. It was an important style and enormous influence in Europe and the Americas through the end of the 19th century, and into the 20th, particularly for the institutional buildings.