Kainga is a settlement on the southern bank of the Waimakariri River, just north of Christchurch, in Canterbury, New Zealand. It lies immediately to the south of Kaiapoi, on a small road leading northeast from State Highway 1. Originally established as a small group of fishing huts on the south side of the Waimakariri, it later developed into a small residential area. A small forestry plantation lies to the southeast of the settlement.