The Gardner Pinnacles are two barren rock outcrops surrounded by a reef and located 946 km (588 miles) northwest of Honolulu in the Hawaiian Islands at . The total area of the two small islets—remnants of an ancient volcano—is 5 acres (20,000 m²). The surrounding reef has an area in excess of 600,000 acres (2,400 km²).
Gardner Pinnacles was first discovered on June 2, 1820 by the American whaler Maro commanded by Captain Joseph Allen.
In the Hawaiian Archipelago, adjacent islands/reefs are French Frigate Shoals to the southeast, and Laysan to the northwest.
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