The Opunake Branch, later the Kapuni Branch, was a branch railway in North Island, New Zealand. It opened in 1924, and ran 36.4 km across the southern slopes of Mount Taranaki to link the rural town of Opunake with the Marton-New Plymouth Line at Te Roti. With the decline of rural freight, part of the line was closed in 1976, but the 10.9 km section to Kapuni was retained and upgraded to service traffic to the Kapuni natural gas field.