Harwoods Hole, Natural limestone cave in Abel Tasman National Park, New Zealand.

Harwoods Hole is a cave system in Abel Tasman National Park, on Tākaka Hill between Golden Bay and Tasman Bay. It starts at the surface as a round entrance 50 metres across and drops 183 metres as New Zealand's deepest vertical shaft, then connects with Starlight Cave. Its overall depth, from the entry down to the outlet, is 357 metres.

Henry Harwood, with John Horton and Thomas Manson, opened up the Canaan Downs area and discovered the hole, but it was not entered at the time. Seven cavers explored it over the 1958/59 summer, lowering the first person on 28 December 1958 with a home-built winch weighing 255 kilograms. The following summer 21 cavers returned, and green dye released inside confirmed the outflow at Starlight Cave. On 4 January 1960 expedition leader Peter Lambert was killed by a rock fall; a cairn with his helmet stands at the bottom of the shaft.

The cave lies in Tākaka Hill, where the Harwoods Hole area was used as a filming location for The Hobbit: An Unexpected Journey. The green dye released inside the cave during the 1959/60 exploration emerged at Starlight Cave, confirming the underground connection to The Gorge Creek at East Tākaka.

The track to Harwoods Hole is no longer marked or maintained by the Department of Conservation because of unstable rock platforms and slippery rocks at the unfenced hole. Access is from a signposted unsealed side road near the top of Tākaka Hill on State Highway 60; after 11 km a car park is reached, from where the former walking track ran 2.9 km. Visitors enter at their own risk.

The shaft is not enlarging: water entering through sinkholes is saturated with calcite, which is deposited inside, so Harwoods Hole is slowly filling in. A cairn at the bottom holds the helmet of Peter Lambert, killed by rock fall on 4 January 1960, the New Zealand Speleological Society's first fatality.