| Class 73 | |
| Powertype: | Diesel |
| Builder: | BN |
| Builddate: | 1965-1977 (three batches) |
| Totalproduction: | 95 |
| Whytetype: | 0-6-0 |
| Driverdiameter: | 12622NaN2 |
| Length: | 11.4m (37.4feet) first batch 11.17m (36.65feet) |
| Fueltype: | diesel |
| Primemover: | Cockerill 6TH695SA or 6T240CO |
| Transmission: | Voith hydraulic |
| Maxspeed: | 30km/h60km/h |
| Operator: | SNCB/NMBS |
| Operatorclass: | 73 |
| Fleetnumbers: | 7301-7395 |
| Disposition: | in service |
The Class 73 is a class of diesel locomotives operated by SNCB/NMBS in Belgium.
The class formed the backbone of the NMBS/SNCB shunter fleet. Class 77s have replaced them but they are still to be found across Belgium . They were built in three batches: 7301-7335 during 1965–1967, 7336-7375 during 1973-1974 and finally 7373–7395 in 1976–1977.