The Armenian Revolutionary Federation (Հայ Յեղափոխական Դաշնակցութիւն, abbr. ARF (ՀՅԴ) or ARF-D) also known as Dashnaktsutyun (Armenian: Դաշնակցություն, lit. "Federation") is an Armenian nationalist and socialist political party founded in 1890 in Tiflis, Russian Empire by Christapor Mikaelian, Stepan Zorian, and Simon Zavarian. , the party operates in Armenia, Artsakh, Lebanon, Iran and in countries where the Armenian diaspora is present. Although it has long been the most influential political party in the Armenian diaspora, it has a comparatively smaller proportional presence in modern-day Armenia. , the party was represented in three national parliaments, with ten seats in the National Assembly of Armenia, three seats in the National Assembly of Artsakh and three seats in the Parliament of Lebanon as part of the March 8 Alliance.
The ARF has traditionally advocated socialist democracy and has been a full member of the Socialist International since 2003; it joined the Second International in 1907. It has the largest membership of the political parties present in the Armenian diaspora, having established affiliates in more than 20 countries. Compared to other diasporan Armenian parties which tend to primarily focus on educational or humanitarian projects, the ARF is the most politically oriented of the organizations and traditionally has been one of the staunchest supporters of Armenian nationalism. The party campaigns for the recognition of the Armenian genocide and the right to reparations. It also advocates the establishment of United Armenia, partially based on the Treaty of Sèvres of 1920.
The ARF originated as a merger of various Armenian political groups, mainly from the Russian Empire, with the declared goal of achieving "the political and economic freedom of Turkish Armenia" by means of armed rebellion. In the 1890s, the party sought to unify the various small groups in the Ottoman Empire that were advocating reform and defending Armenian villages from the massacres and banditry that were widespread in some of the Armenian-populated areas of the empire.