Jacquemart Island, one of the islets surrounding Campbell Island in New Zealand, lies 1 km south of Campbell Island and is the southernmost island of New Zealand.
The name commemorates Captain J. Jacquemart, of the vessel FRWS Vire, that supported the French 1874 Transit of Venus Expedition to Campbell Island.
Jacquemart Island consists of a stack with an area of 19 hectares, being about 750 meters in length by 500 meters in width and surrounded by precipitous cliffs at least 30 meters high at their lowest. Its highest point is about 200 meters above sea level. It is an eroded remnant of basaltic lavas originally laid down on a sedimentary base.
Because of its inaccessibility from the sea, the first visit by humans to the island did not take place until 29 December 1980 when a small party of scientists was landed by helicopter on the summit ridge for a 90-minute survey. Subsequent short visits were made in 1984 and 1997.