Adansonia gregorii, commonly known as the boab and also known by a number of other names, is a tree in the family Malvaceae, endemic to the northern regions of Western Australia and the Northern Territory of Australia.

The specific name gregorii honours the Australian explorer Augustus Gregory.

The most widely recognised common name is 'boab', which is a shortened form of the generic common name 'boabab'. It does, however, have many other common names, including:

Gadawon is one of the names used by the local Aboriginal Australian groups. Other names include larrgadi or larrgadiy, which is widespread in the Nyulnyulan languages of the Western Kimberley.^{[citation needed]}

Other names include:

Endemic to Australia, boab occurs in the Kimberley region of Western Australia and east into the Northern Territory. It is the only baobab to occur in Australia, the others being native to Madagascar and mainland Africa and the Arabian Peninsula. There are various theories as to how the tree got to Australia, with A. gregorii and A. digitata, its African relative, being very similar genetically.

It can grow from sea level to about 300 m (980 ft) in altitude, and is most often found in open forest and rocky areas, but is also seen in monsoon forest.

As with other baobabs, Adansonia gregorii is easily recognised by the swollen base of its trunk, which forms a massive caudex, giving the tree a bottle-like appearance. Boab ranges from 5–15 m (16–49 ft) in height, usually 9–12 m (30–39 ft), with a broad bottle-shaped trunk, up to 5 m (16 ft) in diameter.