The Ammer is a small river in Baden-Württemberg, Germany, a tributary of the Neckar.
It has its source southwest of Herrenberg. Along the southern edge of the Schönbuch, it flows through Herrenberg, Ammerbuch, Unterjesingen and Tübingen, before it discharges into the Neckar at Tübingen-Lustnau after 25 km.
The following rivers join the Ammer:
- Aischbach (Herrenberg)
- Kochhartbach (Ammerbuch-Reusten)
- Käsbach (Ammerbuch-Pfäffingen)
- Sulzbach (Ammerbuch-Pfäffingen)
- Enzbach (Tübingen-Unterjesingen)
- Himbach (between Tübingen and Unterjesingen)
- Weilersbach (Tübingen-West)
- Goldersbach (Tübingen-Lustnau)
Coordinates: 48°35′02″N 8°51′13″E / 48.5839°N 8.85361°E / 48.5839; 8.85361