Monroe Terrace Historic District, Historic residential district in Gary, United States.

Monroe Terrace Historic District is a small residential complex of eight homes with Bungalow and Craftsman-style features along Monroe Street in Gary. The buildings form a cohesive group of early 20th-century dwellings built as a unified housing project.

The eight houses were built starting in 1910 by the United States Sheet & Tin Plate Co. to designs by D. F. Creighton, as examples of the Edison Concept Houses that Thomas Edison designed, patented and promoted. The district was listed in the National Register of Historic Places in 2009.

The houses carry the name Edison Concept Houses, from Thomas Edison's plan to sell cast-concrete homes; the United States Sheet & Tin Plate Co. built them from 1910. D. F. Creighton designed the eight buildings, which show Bungalow and American Craftsman elements such as low-pitched roofs and exposed porch details.

The homes sit closely together on a compact lot and are easy to view from the street. The location is in Gary's industrial area and is best explored on foot, allowing time to notice the details of the facades and rooflines.

The homes were built using concrete construction methods that Thomas Edison had patented, making them an experimental application of this relatively new building material for residences. This concrete experiment marks an important moment when innovative inventors tried to reshape how ordinary people lived.