The Indispensable Reefs are a chain of three large coral atolls in the Coral Sea. They are located about south of Rennell Island. The chain stretches over a length of and its average width is .
Administratively the Indispensable Reef belongs to the Rennell and Bellona Province of Solomon Islands. They are locally called "Goto'akau".
The three atolls are steep-to and each encloses a large deep lagoon. They are separated by deep passages wide. The atolls of the Indispensable Reef are aligned in a NW-SE direction:
The ship Neptune struck Indispensable Reef on 3 August 1868, and was lost. The crew was rescued by the SS Boomerang.
During the Battle of the Coral Sea on 7 May 1942, two Japanese carrier attack planes B5N2 (EI-306 and probably EI-302) flying reconnaissance mission from the carrier Shokaku ditched on Indispensable Reef due to lack of fuel.
In 1983, the Solomon Islands Government apprehended a vessel from Taiwan that had been poaching the giant clam stocks around Indispensable Reef. Corals and endangered fish species are also being plundered for the aquarium trade.