BT4 or BT-4 may refer to:
- BT-4, a type of BT tank Soviet light tanks
- BT-4 (rocket engine), a rocket engine manufactured by IHI Aerospace
- Brabham BT4, a Formula One racing car
- BT4, a BT postcode area for Belfast
This disambiguation page lists articles associated with the same title formed as a letter–number combination.
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