The Keelung campaign was a controversial military campaign undertaken by French forces in northern Formosa (Taiwan) during the Sino-French War. After making a botched attack on Keelung in August 1884, the French landed an expeditionary corps of 2,000 men and captured the port in October 1884. Unable to advance beyond their bridgehead, they were invested inside Keelung by superior Chinese forces under the command of the imperial commissioner Liu Mingchuan. In November and December 1884 cholera and typhoid drained the strength of the French expeditionary corps, while reinforcements for the Chinese army flowed into Formosa via the Pescadores Islands, raising its strength to 35,000 men by the end of the war. Reinforced in January 1885 to a strength of 4,500 men, the French won two impressive tactical victories against the besieging Chinese in late January and early March 1885, but were not strong enough to exploit these victories. The Keelung campaign ended in April 1885 in a strategic and tactical stalemate. The campaign was criticised at the time by Admiral Amédée Courbet, the commander of the French Far East Squadron, as strategically irrelevant and a wasteful diversion of the French navy.

Anatole-Amédée-Prosper Courbet was a French admiral who won a series of important land and naval victories during the Tonkin Campaign (1883–86) and the Sino-French War.