| Coordinates: | 50.7483°N 7.5956°W |
| Image Plan: | Niederirsen in AK.svg |
| State: | Rheinland-Pfalz |
| District: | Altenkirchen |
| Verbandsgemeinde: | Hamm (Sieg) |
| Elevation: | 195 |
| Area: | 2.84 |
| Postal Code: | 57589 |
| Area Code: | 02682 |
| Licence: | AK |
| Gemeindeschlüssel: | 07 1 32 077 |
| Website: | www.hamm-sieg.de |
| Mayor: | Andreas Knipp[1] |
| Leader Term: | 2019 - 24 |
Niederirsen is a municipality in the district of Altenkirchen, in Rhineland-Palatinate, in western Germany.