Max Keil Building is a historic commercial building located at Wilmington, New Castle County, Delaware. It was built about 1850, and modified in the Art Moderne / Art Deco style in 1938. It is a three-story, single-bay commercial building with a rectangular plan built of wall bearing brick construction. The front facade features a large curved glass display window on the first floor and an austere, peach-colored terra-cotta wall with a large rectangular window of structural glass block at the second and third floors.
It was added to the National Register of Historic Places in 1985.