This article examines the representation of the Russo-Japanese War in the early twentieth century American media, focusing on the ways in which Korea was perceived by American people. To this end, the paper analyzes newspaper articles about Chosun (Korea, Corea) that appeared in New York Times, Chicago Tribune, Washington Times, San Francisco Examiner and other local newspapers from 1890 to 1905. In particular, it pays attentions to Jack London’s writings as a war journalist sent to the San Francisco Examiner during the Russo-Japanese War, including a number of photos and articles about Korea(Chosun). Given that London’s writings were relatively more popular than missionaries’ or travelers’ writings, and that his gaze was reproduced and repeated in the eyes of American readers through American media, the Russo-Japanese War was an important event in which the American public’s perception toward Korea or Koreans was shaped.