Horace Mann Historic District, Historic district in Gary, Indiana.

Horace Mann Historic District is a residential area in Gary featuring Colonial Revival, Tudor Revival, and English Cottage-style houses arranged along curvilinear streets with attached garages. The buildings contain five to ten rooms on fifty-foot-wide lots and maintain their original character throughout.

The district's 130 contributing buildings and one contributing site were largely built between 1919 and 1961, with the first houses appearing as Gary expanded. It was listed in the National Register of Historic Places in 2013, recognizing its collection of Colonial Revival, Tudor Revival, Renaissance Revival, Spanish Colonial Revival, and Bungalow/American Craftsman architecture.

The neighborhood reflects Small House movement principles through efficient layouts and technological advancements in early 20th-century residential design. Visitors can see how these homes offered maximum comfort within limited space.

The area is best explored on foot by walking the curving streets and observing the varied house styles up close. Wear comfortable shoes, as visitors spend time examining the neighborhood's architectural details and foundation plantings.

One house design from the area won second prize in the 1926 Chicago Tribune Small House Contest for its innovative spatial solutions. This recognition showed how local architecture influenced national standards for affordable housing design.