| Native Name: | Isenburg-Neumagen |
| Common Name: | Isenburg-Neumagen |
| Empire: | Holy Roman Empire |
| Government Type: | Monarchy |
| Year Start: | 1502 |
| Year End: | 1554 |
| P1: | Lower Isenburg |
| Flag P1: | CoA Lower-Isenburg.svg |
| S1: | Sayn-Homburg |
| Capital: | Neumagen-Dhron |
| Religion: | Catholic |
| Leader1: | Salentin VI |
| Leader2: | Henry |
| Year Leader1: | 1502–1534 |
| Year Leader2: | 1534–1554 |
| Title Leader: | Count |
| Footnote B: | ... |
Isenburg-Neumagen was the name of a state of the Holy Roman Empire, seated in Neumagen-Dhron in modern Rhineland-Palatinate, Germany.
Isenburg-Neumagen was created on the partition of Lower Isenburg in 1502. There were only two counts of Isenburg-Neumagen, and at their extinction it passed to the Counts of Sayn-Homburg.