Fiordland is a geographic region of New Zealand in the south-western corner of the South Island, comprising the westernmost third of Southland. Most of Fiordland is dominated by the steep sides of the snow-capped Southern Alps, deep lakes, and its steep, glacier-carved and now ocean-flooded western valleys.

The name "Fiordland" comes from a variant spelling of the Scandinavian word for this type of steep valley, "fjord". The area of Fiordland is dominated by, and very roughly coterminous with, Fiordland National Park, New Zealand's largest National Park.

Fiordland features a number of fiords, which in this area are typically named sounds, reflecting the fact that sometimes fiords are considered to be a type of a narrow sound. Of the twelve major fiords on Fiordland's west coast, Milford Sound / Piopiotahi is the most famous and the only one accessible by road.

- Wikipedia