| Irnfritz-Messern | |
| Settlement Type: | Municipality |
| Pushpin Map: | Austria |
| Pushpin Mapsize: | 270 |
| Pushpin Map Caption: | Location within Austria |
| Coordinates: | 48.7333°N 48°W |
| Subdivision Type: | Country |
| Subdivision Name: | Austria |
| Subdivision Type1: | State |
| Subdivision Name1: | Lower Austria |
| Subdivision Type2: | District |
| Subdivision Name2: | Horn |
| Parts Style: | para |
| Leader Title: | Mayor |
| Leader Name: | Hermann Gruber |
| Elevation M: | 561 |
| Population Density Km2: | auto |
| Timezone: | CET |
| Timezone Dst: | CEST |
| Utc Offset: | +1 |
| Utc Offset Dst: | +2 |
| Postal Code Type: | Postal code |
| Postal Code: | 3754 and 3761 |
| Area Code Type: | Area code |
| Area Code: | 02986 |
| Website: | www.irnfritz.at |
Irnfritz-Messern is a town in the district of Horn in Lower Austria, Austria.
Irnfritz-Messern is perhaps best known for its Eislaufplatz where people come to ice skate during the winter months. It is also home of the Schloss Wildberg.