| Helmbach | |
| Subdivision Type1: | Country |
| Subdivision Name1: | Germany |
| Subdivision Type2: | State |
| Subdivision Name2: | Rhineland-Palatinate |
| Subdivision Type3: | Region |
| Subdivision Name3: | Palatine Forest |
| Subdivision Type4: | Reference no. |
| Subdivision Name4: | DE: 23782 |
| Source1 Location: | near Forsthaus Taubensuhl |
| Source1 Elevation: | ca. [1] |
| Mouth Location: | Near Helmbach into the Speyerbach |
| Mouth Elevation: | ca. |
| Basin Landmarks: | Large towns: Exclave of Landau in der Pfalz |
| Basin Size: | [2] |
| Tributaries Right: | Grobsbach, Kohlbach |
| Tributaries Left: | Blattbach, Iggelbach |
| Custom Label: | References |
The Helmbach is an long tributary of the Speyerbach stream in the Palatine Forest in the German state of Rhineland-Palatinate.
The stream rises northwest of the Taubensuhl Forester's Lodge (Forsthauses Taubensuhl) and flows initially in a northeasterly direction to the Geiswiese meadow. There it is joined on the left by the Blattbach, which rises on the north slopes of the high Blattberg hill, and then heads in an easterly to northeasterly direction. After another 2 km the Helmbach passes the woodland hotel at Hornesselwiese, which was burnt down in November 2002 and, after being rebuilt in 2010, has been opened again as a woodland restaurant since January 2011 .[3] There the stream is joined by the Grobsbach and, further on, the Iggelbach empties into it from the left. After a total of the Helmbach reaches another forester's lodge, the Forsthaus Helmbach. Here it is joined on the right by the Kohlbach, which has been impounded to create the reservoir of Helmbachweiher a little to the east. The Helmbach itself discharges into the Speyerbach at the eponymous village of Helmbach after about . Here there is a halt on the Kuckucksbähnel heritage railway.