Buckinghamia celsissima, commonly known as the ivory curl, is a species of trees, constituting part of the plant family Proteaceae. They grow naturally only (endemic) in the wet tropics rainforests areas of north eastern Queensland, Australia.

The species was described in 1868 by Ferdinand von Mueller in honour of Richard Grenville, 3rd Duke of Buckingham, from a collection of material made by John Dallachy near Rockingham Bay on 11 January 1865. Its specific epithet is Latin for "very tall". Common names include ivory curl flower and spotted silky oak.

Buckinghamia celsissima reaches 30 m (98 ft) tall in its natural rainforest habitat, but is much smaller, reaching 10 m (33 ft) tall, in Australian east coast gardens. Glossy dark green above and whitish below, the leaves are quite variable. Juvenile leaves have one or more lobes while adult leaves are simple and entire, measuring 8 to 16 cm (3.1 to 6.3 in) long by 3–7 cm (1.2–2.8 in) wide.

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