Sir James Clark Ross (15 April 1800 – 3 April 1862), was a British naval officer and explorer. He explored the Arctic with his uncle Sir John Ross and Sir William Parry, and later led his own expedition to Antarctica.
Ross was born in London, the nephew of Sir John Ross under whom he entered the navy in 1812, accompanying him on Sir John's first Arctic voyage in search of a Northwest Passage in 1818. Between 1819 and 1827, Ross took part in four Arctic expeditions under Parry, and in 1829 to 1833, again served under his uncle on Sir John's second Arctic voyage. It was during this trip that they located the position of the North Magnetic Pole on 1 June 1831 on the Boothia Peninsula in the far north of Canada. It was on this trip, too, that Ross charted the Beaufort Islands, later renamed Clarence Islands by his uncle.
In 1834, Ross was promoted to captain, and from 1835 to 1838, he was employed on the magnetic survey of Great Britain.