Charles King Armstrong (born February 11, 1962) is an American historian of North Korea. From 2005 to 2020, he worked as the Korea Foundation Professor of Korean Studies at Columbia University, spending his last year on sabbatical after the university's determination that he had committed extensive plagiarism. Armstrong's works dealt with revolutions, cultures of socialism, architectural history, and diplomatic history in the contexts of East Asia and modern Korea, with a focus on North Korea.