The unification of Romania and Moldova (Romanian: Unirea Republicii Moldova cu România) is a popular concept in the two countries beginning with the late 1980s, during the dissolution of the Soviet Union. The Romanian Revolution in 1989 and the independence of Moldova in 1991 further contributed to the development of a movement for the unification of the two Romanian-speaking countries. The question of reunification is recurrent in the public sphere of the two countries, often as a speculation, both as a goal and a danger. The idea, while widespread in Romania, is only supported by a minority in Moldova.
Individuals who advocate the unification are usually called "unionists" (unioniști). Some support it as a peaceful process based on consent in the two countries, others in the name of a "Romanian historical right over Bessarabia". The supporters of the union refer to the opponents as "Moldovenists" (moldoveniști).
The Principality of Moldavia was a vassal state of the Ottoman Empire and its eastern territories between the Prut and the Dniestr (approximately half of the principality) were annexed by the Russian Empire in 1812, in accordance with the Treaty of Bucharest. The Russians referred to this new region as Bessarabia, taking a name that had previously only applied to a southern portion of the region (known also as the "Budjak") and extending it to cover the entire newly annexed territory. The name derives from the Wallachian Basarab dynasty, who had presided over the southern portion in the Middle Ages. During the Russian Revolution of 1917, a newly formed regional parliament (Sfatul Țării) declared Bessarabia's autonomy within Russia. In 1918, after the Romanian army entered Bessarabia, the makeshift parliament decided on independence, only to review its position and ultimately decide on a conditional union with Romania. The conditions, including the provisions for autonomy, were ultimately dropped.