The NZR DSB class locomotive[nb 1] is a type of shunting locomotive introduced to New Zealand's national rail network in 1954 by New Zealand Railways (NZR).

The DSB are a larger and more powerful locomotive than the DS and DSA classes and were used all over New Zealand.

A second batch of three locomotives built by Mitsubishi Heavy Industries was introduced in 1967.

By the end of their lives, 12 DSBs were repainted in the "International Orange" livery.

[2] As of July 2014 only one DSB class has been preserved, DSB313 was purchased in January 1991 by the Mainline Steam Heritage Trust for shunting at their Parnell depot.