Đông Du (pronounced "dong yu" in Southern Vietnamese accent and "dong zu" in Northern Vietnamese accent, Vietnamese for Eastern study, Japanese 東遊) was a Vietnamese political movement founded by Phan Bội Châu at the start of the 20th century that encouraged young Vietnamese to go east to Japan to study, in the hope of training a new era of revolutionaries to rise against French colonial rule. Other notable proponents of Dong Du include Phan Chu Trinh and Prince Cường Để. In 1906 there were only 20 students in Japan, but October 1907, there were over 100 students in Japan, more than half from the South.
- Van Dao Hoang - A Contemporary History Page 4 2008 "In 1905, the patriot Phan Bội Châu and his comrades initiated the Đông Du (Eastern Study) movement.7 This organization made relations with Japan aimed at secretly sending its excellent students to Japan to receive better education."
- Sính Vĩnh -Phan B̂ọi Châu and the Đông-du movement 1988
- Nghia M. Vo Saigon: A History Page 93 2011 ...support the Đông Du movement. By October 1907, there were more than 100 students in Japan—more than half from the South—compared to only 20 in 1906. By mid–1908, southern students became the majority, with 100 from the South, ..."
- Philippe M. F. Peycam - The Birth of Vietnamese Political Journalism: Saigon, 1916-1930 2012- Page 56 "During Chiêu's trial, the French discovered that he had been a central agent for an underground movement called the Association for the Modernization ... funds for the Đông du movement but also to promote these changes for their own sake."