| Type: | Rapid transit |
| System: | Berlin U-Bahn |
| Locale: | Berlin |
| Start: | Warschauer Straße |
| End: | Uhlandstraße |
| Stations: | 13 |
| Event1label: | Created |
| Event2label: | Renumbered to U1 |
| Operator: | Berliner Verkehrsbetriebe |
| Linelength Km: | 9.0 |
| Linelength: | [1] |
| Load Gauge: | German: [[Kleinprofil]] |
| Electrification: | third rail (top running) |
| Map State: | collapsed |
The U15 was a line on the Berlin U-Bahn. Originally the U3 running between Wittenbergplatz and Uhlandstraße, it became a branch of the U1 in 1993 as part of the reorganisation of the network following the reopening of the U2.
On December 12, 2004, it was renumbered as the U1.