Greater Moldova or Greater Moldavia (Romanian: Moldova Mare; Moldovan Cyrillic: Молдова Маре) is an irredentist concept today used for the credence that the Republic of Moldova should be expanded with lands that used to belong to the Principality of Moldavia or were once inside its political orbit. Historically, it also meant the unification of the lands of the former principality under either Romania or the Soviet Union. Territories cited in such proposals always include Western Moldavia and the whole of Bessarabia, as well as Bukovina and the Hertsa region; some versions also feature parts of Transylvania, while still others include areas of Podolia, or Pokuttia in its entirety. In most of its post-Soviet iterations, "Greater Moldova" is associated with a belief that Moldovans are a distinct people from Romanians, and that they inhabit parts of Romania and Ukraine. It is a marginal position within the Moldovan identity disputes, corresponding to radical forms of an ideology polemically known as "Moldovenism".
The origins of the idea can be traced back to the 1812 annexation of Bessarabia by the Russian Empire, which was regarded as an injustice by the Principality's political elite. Their grievances, formulated as protests to the European powers, were only partly quelled by the brief reunification with southern Bessarabia (1856–1878). During that same interval, Moldavian demands fused into the larger agenda of Romanian nationalism, leading to the formation of the United Principalities and their shared aspiration toward a Greater Romania. Support for a Greater or Unified Moldavia was manifest among a subgroup of Romanian nationalists who also endorsed regional autonomy. The more particular goal of a restored Greater Moldavia, independent and fully separated from Wallachia, survived in this setting until the 1870s, being encouraged in its own aspirations by the forgeries of Constantin Sion.
Upon the end of World War II, the idea of Greater Moldova was briefly considered by the political apparatus of the Soviet Union. Initial plans were drafted by Ana Pauker and Gherasim Rudi, who wanted Soviet Moldavia (already comprising most of Bessarabia) enlarged westward toward the Siret, with Iași for its capital; their project was vetoed by Joseph Stalin. As a member of the Soviet Moldavian leadership, Nikita Salogor made other concrete proposals; his version made explicit territorial demands on both Romania and the Ukrainian SSR, generating controversy with the latter. Salogor's project was shelved, but, through the likes of Artiom Lazarev, some of its core assumptions were replicated into the 1970s. A nostalgia for the Principality was also implicit in the Soviet celebration of "Moldovan" figures who had lived in Romania. Once Moldova declared its independence in 1991, some core tenets of Greater Moldovan irredentism were tentatively embraced by both the Party of Communists and the Party of Socialists, while the integral version was taken up by the Greater Moldova Party.