Tokomaru is a small town in the district of Horowhenua, in the southwestern North Island of New Zealand. It is located 18 kilometres southwest of Palmerston North, and a similar distance northeast of Shannon. The Tokomaru railway station on the North Island Main Trunk was open from 1885 to 1982.

Horowhenua District is a territorial authority district on the west coast of the North Island of New Zealand, administered by Horowhenua District Council. Located north of Wellington and Kāpiti, it stretches from slightly north of the town of Ōtaki in the south to just south of Himatangi in the north, and from the coast to the top of the Tararua Range. It is in the Manawatū-Whanganui local government region. The name Horowhenua is Māori for landslide.