An Jung-geun, sometimes spelled Ahn Joong-keun, was a Korean independence activist and pan-Asianist. His baptismal name was Thomas (도마).

The Korean independence movement was a series of diplomatic and militant efforts to liberate Korea from Japanese rule. The movement began around the late 19th or early 20th century, and ended with the surrender of Japan in 1945. As independence activism on the peninsula was largely suppressed by Japan, many significant efforts were conducted abroad by the Korean diaspora, as well as by a number of sympathetic non-Koreans.