Horotiu is a small township on the west bank of the Waikato River in the Waikato District of New Zealand. It is on the Waikato Plains 13 km (8.1 mi) north of Hamilton and 5 km (3.1 mi) south of Ngāruawāhia. From early in the 20th century it developed around a freezing works and other industries. The North Island Main Trunk railway runs through the town, as did State Highway 1 until opening of part of the Waikato Expressway in 2013. An hourly bus runs between Huntly and Hamilton.