The New Zealand rock wren is a small New Zealand wren endemic to the South Island of New Zealand. Its Māori names include pīwauwau, mātuitui, and tuke. Outside New Zealand it is sometimes known as the rockwren to distinguish it from the unrelated rock wren of North America.

The New Zealand wrens are a family (Acanthisittidae) of tiny passerines endemic to New Zealand. They were represented by seven Holocene species in four or five genera, although only two species in two genera survive today. They are understood to form a distinct lineage within the passerines, but authorities differ on their assignment to the oscines or suboscines. More recent studies suggest that they form a third, most ancient, suborder Acanthisitti and have no living close relatives at all. They are called "wrens" due to similarities in appearance and behaviour to the true wrens (Troglodytidae) but are not members of that family.