| Isenburg | |
| Image Coa: | Wappen Isenburg (Westerwald).png |
| Coordinates: | 50.4772°N 7.5897°W |
| Image Plan: | Isenburg in NR.svg |
| State: | Rheinland-Pfalz |
| District: | Neuwied |
| Verbandsgemeinde: | Dierdorf |
| Elevation: | 160 |
| Area: | 4.17 |
| Postal Code: | 56271 |
| Area Code: | 02601 |
| Licence: | NR |
| Gemeindeschlüssel: | 07 1 38 031 |
| Mayor: | Detlef Mohr[1] |
| Leader Term: | 2019 - 24 |
Isenburg is a municipality in the district of Neuwied, in Rhineland-Palatinate, Germany.
The castle was built by the Counts of Isenburg around 1100 if not prior. Occupied by several branches of the Isenburg family (as a Ganerbenburg), it was inhabited into the early 17th century. Shortly after being abandoned, it became a ruin. After the branch of Lower Isenburg had extinguished in 1664 with count Ernst of Isenburg-Grenzau, the county was partitioned between the counts of Walderdorff and the counts of Wied-Neuwied. The present owner of the castle is Maximilian, 9th Prince of Wied, son of Carl, 8th Prince of Wied and Princess Isabelle of Isenburg.