Mangamutu is a small settlement, on the western outskirts of Pahiatua, in the North Island of New Zealand.

The Wairarapa Line runs through the area, with the Pahiatua railway station in the settlement.

[1] The settlement was the birthplace of former New Zealand Prime Minister and Governor General Sir Keith Holyoake.

[3] The original European settlement was named Scarborough, after the town in Yorkshire, England.

When a post office was established, the name was changed because there was already a Scarborough near Timaru.