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 north of Hamilton and 5 km 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.