Urtica ferox, commonly known as tree nettle and, in Māori, ongaonga, taraonga, taraongaonga оr okaoka is a species of nettle endemic to New Zealand. Unlike the other species in the genus Urtica found in New Zealand, all of which are herbaceous, ongaonga is a large woody shrub that can grow to a height of 3 m (9.8 ft), with the base of the stem reaching 12 cm (4.7 in) in thickness. It has large spines that can result in a painful sting that lasts several days.

The plant is the main source of food for larvae of the New Zealand red admiral butterfly.

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