| Type: | Samtgemeinde |
| Ilmenau | |
| Image Coa: | DEU Samtgemeinde Ilmenau COA.svg |
| Coordinates: | 53.1833°N 34°W |
| State: | Niedersachsen |
| District: | Lüneburg |
| Area: | 69.70 |
| Gemeindeschlüssel: | 033555405 |
| Postal Code: | 21406, 21407, 21409 |
| Area Code: | 04131, 04134 |
| Licence: | LG |
| Divisions: | 4 districts |
| Website: | www.samtgemeinde-ilmenau.de |
| Mayor: | Peter Rowohlt[1] |
| Leader Term: | 2021 - 26 |
| Party: | SPD |
Ilmenau is a Samtgemeinde ("collective municipality") in the district of Lüneburg, in Lower Saxony, Germany. It is situated along the river Ilmenau (hence the name), approx. 8 km south of Lüneburg. Its seat is in the village Melbeck.
The Samtgemeinde Ilmenau consists of the following municipalities: