| Geiselbach | |
| Subdivision Type1: | Country |
| Subdivision Name1: | Germany |
| Subdivision Type2: | States |
| Subdivision Name2: | Bavaria and Hesse |
| Subdivision Type3: | Reference no. |
| Subdivision Name3: | DE: 247728 |
| Length Km: | 6.5 |
| Source1 Location: | near Geiselbach |
| Mouth Location: | near Niedersteinbach in the Kahl |
| Tributaries Left: | Omersbach |
| Custom Label: | References |
The Geiselbach is a right tributary of the Kahl in the northern Spessart in Bavaria and Hesse, Germany. It is 5,2 km (3,2 mi) long and begins at the confluence of multiple headstreams in Geiselbach. The largest tributary is the Omersbach. It discharges near the Teufelsmühle ("Devil's Mill"). The Geiselbach flows through the Teufelsgrund ("Devil's Valley") to Hüttelngesäß and forms the border between Hesse and Bavaria. Near the village Brücken it empties into the Kahl.
Together with Westerbach, Sommerkahl and Reichenbach, the Geiselbach is one of the largest tributaries of the Kahl.