Carmichaelia williamsii (common name William's broom or giant-flowered broom)[4] is a species of plant in the family Fabaceae.

[4][2] Its conservation status (2018) is "At Risk (relict)" under the New Zealand Threat Classification System.

[1] Carmichaelia williamsii is the only yellow-flowered native broom, and it is distinguished from the introduced broom (Cytisus scoparius (L.) Link) by its light green, much wider, and more flattened branches, together with its larger, pale-yellow flowers which have purple or red veins, and its late-winter flowering (July to October, though flowering can occur throughout the year).

[3] It is a coastal species found in open forest, scrub, cliff faces and on scree.

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