Tauwharenīkau is a rural locality and a statistical area in the South Wairarapa District and Wellington Region of New Zealand's North Island.

The locality is on SH 1 about 5 km east of Featherston and 7 km southwest of Greytown by road, and the statistical area covers the Tauwharenīkau River valley and plain north of SH 53.

The name Tauwharenīkau, spelt Tauherenikau until 2023, means "the house made of nīkau palm fronds".

[5] Fernside Homestead is a large wooden house built in 1924 on the west side of the river near Tauwharenikau.

[6] Tauwharenīkau is in three SA1 statistical areas which cover 69.51 km2 (26.84 sq mi).

The percentage of people born overseas was 20.2, compared with 27.1% nationally.