National Register of Historic Places listings in Allen County, Indiana

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

This is intended to be a complete list of the properties and districts on the National Register of Historic Places in Allen 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 Google map.

There are 64 properties and districts listed on the National Register in the county, including 2 National Historic Landmarks. Another 3 properties were once listed but have been removed.

Properties and districts located in incorporated areas display the name of the municipality, while properties and districts in unincorporated areas display the name of their civil township. Properties and districts split between multiple jurisdictions display the names of all jurisdictions.