| TU4 | |
| Powertype: | Diesel |
| Builder: | Kambarka Engineering Works |
| Maxspeed: | 50km/h |
| Transmission: | hydraulic |
| Builddate: | 1962 - 1974 |
| Gauge: | |
| Fueltype: | Diesel |
| Operatorclass: |  Belarus - ТУ4 Estonia - ТУ4 Finland - TU4 Latvia - ТУ4 Lithuania - ТУ4 Norway - ТU4- ТУ4  Sweden - TU4 Ukraine - ТУ4 |
| Length: | 8400frac=8NaNfrac=8 |
| Width: | 2650frac=8NaNfrac=8 |
| Height: | 3295frac=8NaNfrac=8 |
| Wheeldiameter: | 600mm |
| Minimumcurve: | 40m (130feet) |
| Locoweight: | 17.1t(?) |
| Axleload: | 4t |
| Primemover: | У1Д6-250ТК |
| Poweroutput: | 250hp |
| Uicclass: | B'B' |
TU4 (ТУ4) is a Soviet narrow-gauge diesel locomotive for the track gauge of .
The first TU4 was built in 1962 at the Kambarka Engineering Works. 3210 TU4 locomotives were produced until 1974. The locomotives were used on many narrow-gauge railways to move cargo as well as passenger trains.[1]