| Country: | DEU |
| Type: | A |
| Route: | 864 |
| Length Km: | 6 |
| States: | Baden-Württemberg |
is an autobahn spur in southwestern Germany, connecting Donaueschingen with Bad Dürrheim.
The A 864 was supposed to be a part of the planned A 86. The current Autobahn still retains its kilometer counter, which counts from 84 to 90.