The Battle of Inchon (Korean: 인천 상륙 작전, Hanja: 仁川上陸作戰, Incheon Sangnyuk Jakjeon; code name: Operation Chromite) was an amphibious invasion and battle of the Korean War that resulted in a decisive victory and strategic reversal in favor of the United Nations (UN). The operation involved some 75,000 troops and 261 naval vessels, and led to the recapture of the South Korean capital Seoul two weeks later.

The battle began on September 15, 1950, and ended September 19. Through a surprise amphibious assault far from the Pusan Perimeter that UN and South Korean forces were desperately defending, the largely undefended city of Incheon was secured after being bombed by UN forces. The battle ended a string of victories by the invading North Korean People's Army (NKPA). The subsequent UN recapture of Seoul partially severed NKPA's supply lines in South Korea.

The majority of United Nations ground forces involved were U.S. Marines, commanded by General of the Army Douglas MacArthur. MacArthur was the driving force behind the operation, overcoming the strong misgivings of more cautious generals to a risky assault over extremely unfavorable terrain.