The New Zealand DC class is a class of diesel-electric mainline locomotive on the New Zealand rail network, operated by KiwiRail primarily on freight trains, but also on long-distance KiwiRail Scenic passenger trains. The class was rebuilt from the DA class in the late 1970s and early 1980s, mainly in Australia. After the DA class they were the most numerous class of diesel locomotive on New Zealand's railway network, and remained numerically dominant until the mid-2010s when withdrawals began.