Sir James John Gordon Bremer (26 September 1786 – 14 February 1850) was a Royal Navy officer. He served in the Napoleonic Wars, First Anglo-Burmese War, and First Anglo-Chinese War. In China, he served twice as commander-in-chief of British forces.

Born in Portsea, Portsmouth, Bremer joined the Royal Naval College as a student in 1797. While serving in the East Indies, he became commander of HMS Rattlesnake in 1807. He was promoted to captain in 1814 and was nominated a CB the following year. After becoming commander of HMS Tamar, he was sent to Melville Island, Australia, in 1824 to establish a colony. Under his leadership, the north coast of Australia from 129° to 135° longitude was claimed as British territory. He also led the Battle of Berbera in 1827.Bremer served twice as commander-in-chief of British forces in the First Anglo-Chinese War from 1839 to 1841. During the war, he took formal possession of Hong Kong Island for the United Kingdom in 1841. He was made a KCB the same year. In 1846, he was appointed with Sir Francis Augustus Collier to the joint command of the Channel Squadron and became commodore-superintendent of Woolwich Dockyard from which he retired in 1848. He died in 1850, having risen to the rank of rear-admiral.