James Booth Lockwood (b. October 9, 1852, Annapolis, Maryland−d. April 9, 1884, Cape Sabine, in present day Nunavut), was an American arctic explorer. He was among those lost during the Lady Franklin Bay Expedition.
Lockwood was the son of General Henry Hayes Lockwood and his wife Anna. He was commissioned second lieutenant in the U.S. Army in 1873. In 1881, Lockwood signed up for the Lady Franklin Bay Expedition under Adolphus W. Greely, and was accepted as second-in-command.
During the expedition, Lockwood led a sledging party, with David Legge Brainard, to Mary Murray Island, off northern Greenland, at a latitude of 83°24'30", which broke the record of the time for the most northerly point reached. In 1883, he crossed Grant Land, reaching the western shore of Ellesmere Island. He died at Cape Sabine, Canada, along with several other members of the expedition party, before the surviving members were rescued on June 22, 1884.