United Armenia, also known as Greater Armenia or Great Armenia, is an Armenian ethno-nationalist irredentist concept referring to areas within the traditional Armenian homeland—the Armenian Highland—which are currently or have historically been mostly populated by Armenians. The idea of what Armenians see as unification of their historical lands was prevalent throughout the 20th century and has been advocated by individuals, various organizations and institutions, including the nationalist parties Armenian Revolutionary Federation and Heritage, the ASALA and others.

The Armenian Revolutionary Federation, also known as Dashnaktsutyun, is an Armenian nationalist and socialist political party founded in 1890 in Tiflis, Russian Empire by Christapor Mikaelian, Stepan Zorian, and Simon Zavarian. As of 2023, the party operates in Armenia, Lebanon, Iran and in countries where the Armenian diaspora is present. The party was also active in Artsakh until the Azerbaijani offensive in September 2023. 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. As of October 2023, the party was represented in two national parliaments, with ten seats in the National Assembly of Armenia and three seats in the Parliament of Lebanon as part of the March 8 Alliance.