The Haast-Hollyford road or Haast-Hollyford Highway is a long-standing proposal to link Haast, a coastal town north of Milford Sound, via the Hollyford Valley to Milford Sound and Te Anau in the South Island of New Zealand. Proposals for this road have been mooted since the 1880s. It would allow a multi-day round trip, for example from Queenstown to Te Anau to Milford Sound to Haast and back to Queenstown. However, high costs associated with building around 120 km of new road in a remote area (estimated at NZ$165–275 million) and issues with constructing a new road through Fiordland National Park were noted, in addition to the new route possibly increasing congestion on the shared part of the route (from the Hollyford Valley to Milford Sound).