National Register of Historic Places listings in Marion County, Indiana

This is a list of the National Register of Historic Places listings in Marion County, Indiana.

This is intended to be a complete list of the properties and districts on the National Register of Historic Places in Marion County, Indiana, United States. Latitude and longitude coordinates are provided for many National Register properties and districts; these locations may be seen together in a map.

There are 237 properties and districts listed on the National Register in the county, including 9 National Historic Landmarks. Because Indianapolis is coextensive with Marion County, properties are listed by township rather than by city or town. Center Township is the location of 171 of these properties and districts, including 6 of the National Historic Landmarks; these properties and districts are listed separately. Properties and districts in Marion County's other townships are listed here. One district, the Indianapolis Park and Boulevard System, is split between Center Township and three other townships, and is thus included on both lists. Eight other properties, including seven in Center Township, were once listed but have since been removed.