Jacques Maroger (French pronunciation: [maʁɔʒe]; 1884–1962) was a painter and the technical director of the Louvre Museum's laboratory in Paris.

As Maroger's teacher, Anquetin provided guidance in the study of drawing, anatomy and master painting techniques.

He served as a professor at the Louvre School, a Member of the Conservation Committee, General Secretary of the International Experts, and President of the Restorers of France.

Frank Redelius' book, published in 2009, is titled The Master Keys: A Painter's Treatise On The Pictorial Technique Of Oil Painting.

Maroger has been criticized by some modern writers on painting because of his bold claims about having found the secret formulas of the Masters.

However, recently, two conservators in a museum in New England examined and studied the work of John Stuart Curry who was an avid fan of Maroger.

Many of the media involved in Curry's work (and other followers of Maroger) bear no resemblance whatsoever to the modern mastic varnish/black oil recipe.

[citation needed] Maroger medium which is not made properly may contain a large amount of dirt and impurities from improperly filtered mastic varnish, or the black oil may be overcooked, both of which would contribute to darkening and weakening of the work.

Conservation science has shown that the presence of natural resins like mastic in the paint film causes embrittlement, darkening, and continued solubility.

Many paint makers now offer faux-maroger's media or faux-megilps, generally made by substituting different materials, such as lime, for genuine lead, or (as in the case of Gamblin's Neo-Megilp) by creating a similar product out of specially thickened alkyd medium.

The white gingerbread cottage that was Maroger's home in Baltimore is found on the east campus of Loyola College in Maryland and is used for drawing and painting courses.