| Württemberg B/B2 | |
| Bgcolor: | BD1220 |
| Color: | FFFFFF |
| Builder: | Esslingen |
| Builddate: | 1868–1878 |
| Totalproduction: | 86 |
| Uicclass: | 1B n2 |
| Leadingdiameter: | 930frac=8NaNfrac=8 |
| Driverdiameter: | 1530frac=8NaNfrac=8 |
| Over Bufferbeams: | ~ 13120frac=4NaNfrac=4 |
| Watercap: | 6.5m2 |
| Boilerpressure: | 9sigfig=3NaNsigfig=3 |
| Fireboxarea: | 0.98m2 |
| Evaporativearea: | 102.58m2 |
| Cylindersize: | 408frac=16NaNfrac=16 |
| Pistonstroke: | 561frac=16NaNfrac=16 |
The Württemberg Class B and Class B2 engines were steam locomotives with the Royal Württemberg State Railways (Königlich Württembergische Staats-Eisenbahnen) first built in 1868 by the Maschinenfabrik Esslingen ('Esslingen engineering works') in Esslingen in the former Kingdom of Württemberg in southern Germany.
The engines had a Crampton boiler, an inside Allan valve gear and, for the first time in Württemberg, a Prüsmann chimney. They were equipped with 2 T 6.5 tenders.