| Bavarian B III | |
| Bgcolor: | 0081FF |
| Color: | FFFFFF |
| Builddate: | 1852–1855 |
| Totalproduction: | 18 |
| Leadingdiameter: | 915frac=8NaNfrac=8 |
| Driverdiameter: | 1448– |
| Over Bufferbeams: | 13905– |
| Axleload: | 10.4t11.6t |
| Serviceweight: | 30.1t33.2t |
| Weightondrivers: | 20.9t23.3t |
| Watercap: | 5m2 |
| Boiler: | Crampton |
| Fireboxarea: | 1.24m2 |
| Evaporativearea: | 101.1m2 |
| Cylindercount: | 2 |
| Cylindersize: | 406frac=16NaNfrac=16 |
| Pistonstroke: | 610frac=16NaNfrac=16 |
| Maxspeed: | 700NaN0 |
| Retiredate: | 1897 |
Bavarian B IIIs were steam locomotives of the Royal Bavarian State Railways (Königlich Bayerische Staatsbahn).
Eight examples were delivered by Maffei in 1852; the remainder came from Hartmann. The machines by Hartmann had great similarity to those of the Class A IV, which were manufactured at the same time. Unlike the Hartmann engines, these locomotives also had a steam dome. This was later added to the Hartmann variants. All the engines had a Crampton boiler with smooth tubes and a Kirchweger condenser.
They were equipped with a 3 T 5 tender.