Polk Street Concrete Cottage Historic District, Historic residential district in Gary, United States.

The Polk Street Concrete Cottage Historic District is a residential district in Gary, Indiana's First Subdivision, with four contributing buildings designed by D. F. Creighton and built by the United States Sheet & Tin Plate Co. from 1910. The houses are Edison Concept Houses, patented and promoted by Thomas Edison, and show Bungalow and American Craftsman elements.

These homes were designed in 1910 by architect D.F. Creighton for the United States Sheet & Tin Plate Company, drawing on concepts developed by Thomas Edison. Their construction was part of an industrial experiment to test new building materials in a rapidly growing manufacturing city.

The cottages are Edison Concept Houses, a system Thomas Edison designed, patented and promoted; the United States Sheet & Tin Plate Co. built them from 1910 using D. F. Creighton's designs. Visitors can read the Bungalow and American Craftsman elements — wide porches and simple geometric lines — in poured concrete rather than wood.

The four cottages stand in a residential section of Gary's First Subdivision, near the coordinates 41.59972, -87.35000. They are private homes on Polk Street, so visitors see them from the public street and sidewalk rather than entering. The buildings are contributing properties of a district listed on the National Register in 2011.

The homes realized ideas that Thomas Edison championed for cheaper and faster building, making them pioneers of concrete modernization. This experimental housing concept was part of a broader movement to streamline construction in the early twentieth century.