The Nasu (acronym for Nauha-Sisu, English: Track Sisu; also meaning "Piglet" in colloquial Finnish) is a tracked articulated, all-terrain transport vehicle developed by Sisu Auto for the Finnish Army.

Although it looks externally like the Bandvagn 206, which also is in Finnish Army use, it is an entirely new design, and almost 1 meter longer and 1,000 kg (2,205 lb) heavier.

The Nasu is designed to carry troops and equipment through snow and bog-lands in northern Finland.

The low ground pressure enables the Nasu to cope with a wide range of difficult conditions.

More than 500 vehicles of this type have been manufactured and it is used as a personnel carrier and a weapons platform (for BGM-71 TOW anti-tank guided missiles, 120 mm mortars).