The 1878 Treaty of San Stefano (; Peace of San-Stefano, ; Peace treaty of San-Stefano, or ) was a treaty between the Russian and Ottoman empires at the conclusion of the Russo-Turkish War of 1877–1878. It was signed at San Stefano, then a village west of Constantinople (present-day Istanbul), on by Count Nicholas Pavlovich Ignatiev and Aleksandr Nelidov on behalf of the Russian Empire and by Foreign Minister Saffet Pasha and Ambassador to Germany Sadullah Pasha on behalf of the Ottoman Empire.
The treaty provided for the establishment of an autonomous Principality of Bulgaria following almost 500 years of Ottoman rule in the Bulgarian lands. Bulgarians celebrate the day the treaty was signed, , as Liberation Day. However, the enlarged Bulgaria envisioned by the treaty alarmed neighboring states as well as France and the United Kingdom. As a result, the enlargement was never implemented, being superseded by the Treaty of Berlin following the Congress of the same name that took place three months later.
Effects
On Bulgaria
right|thumb|300px|Borders of Bulgaria according to the Preliminary Treaty of San Stefano and the Treaty of Berlin.
thumb|Bulgaria after the Conference of Constantinople, 1876
thumb|Bulgaria after the Treaty of San Stefano, 1878
The treaty established the autonomous self-governing Principality of Bulgaria, with a Christian government and the right to keep an army. Though still de jure tributary to the Ottomans, the Principality de facto functioned as an independent nation. Its territory included the plain between the Danube and the Balkan mountain range (Stara Planina), the region of Sofia, Pirot and Vranje in the Morava valley, Northern Thrace, parts of Eastern Thrace and nearly all of Macedonia (Article 6).
Bulgaria would thus have had direct access to the Mediterranean. This carried the potential of Russian ships eventually using Bulgarian Mediterranean ports as naval bases, which the other Great Powers greatly disliked.
A prince elected by the people, approved by the Ottoman Empire, and recognized by the Great Powers was to take the helm of the country (Article 7). A council of Bulgarian noblemen was to draft a constitution (also Article 7). (They produced the Tarnovo Constitution.) Ottoman troops were to withdraw from Bulgaria, while Russian troops would remain for two more years (Article 8).
According to Philip Roeder, the Treaty of San Stefano "transformed" Bulgarian nationalism, turning it from a disunited movement into a united one.
Montenegro, Serbia, and Romania
Under the treaty, Montenegro more than doubled its territory, acquiring formerly Ottoman-controlled areas including the cities of Nikšić, Podgorica, and Bar (Article 1), and the Ottoman Empire recognized its independence (Article 2).
Serbia gained the cities of Niš and Leskovac in Moravian Serbia and became independent (Article 3).
Turkey recognized the independence of Romania (Article 5) while the latter gained Northern Dobruja from Russia (to which it was transferred from the Ottoman Empire) and ceded Southern Bessarabia in a forced exchange.
On Russia and the Ottoman Empire
right|250px|thumb|The Treaty was signed in this house of the Simenoğlu (Simeonoglou) family in [[Yeşilköy.]]
right|250px|thumb|1878 Woodblock Print "Signing The Treaty of Peace Between Russia and Turkey At San Stefano, Near Constantinople."
In exchange for war reparations, the Sublime Porte ceded Armenian and Georgian territories in the Caucasus to Russia, including Ardahan, Artvin, Batum, Kars, Olti, Beyazit, and Alashkert. Additionally, it ceded Northern Dobruja, which Russia handed to Romania in exchange for Southern Bessarabia (Article 19).
Article 21 allowed the population living in areas conquered by Russia to sell property and immigrate to Turkey. The Treaty of Berlin kept a similar provision. Many Adjarians left Adjara at this time.
On other regions
The Vilayet of Bosnia (Bosnia and Herzegovina) was supposed to become an autonomous province (Article 14). Crete, Epirus and Thessaly were to receive a limited form of local self-government (Article 15
Reaction
thumb|400px|Maps of the region after the Treaty of San Stefano and the Congress of Berlin of 1878
The Great Powers, especially British Prime Minister Benjamin Disraeli, were unhappy with this extension of Russian power, and Serbia feared that the establishment of Greater Bulgaria would harm its interests in the former and remaining Ottoman territories. These reasons prompted the Great Powers to obtain a revision of the treaty at the Congress of Berlin, and substitute it with the Treaty of Berlin.
Romania, which had contributed significantly to the Russian victory in the war, was extremely disappointed by the treaty, and the Romanian public perceived some of its stipulations as Russia breaking the Russo-Romanian pre-war treaties that guaranteed the integrity of Romanian territory.
Austria-Hungary was disappointed with the treaty as it failed to expand its influence in Bosnia and Herzegovina.
The Albanians, dwelling in provinces controlled by the Ottoman Empire, objected to what they considered a significant loss of their territory to Serbia, Bulgaria, and Montenegro and realized they would have to organize nationally to attract the assistance of foreign powers seeking to neutralize Russia's influence in the region. The implications of the treaty led to the formation of the League of Prizren.
In the "Salisbury Circular" of 1 April 1878, the British Foreign Secretary Robert Cecil, made clear his and his government's objections to the Treaty of San Stefano and the favorable position in which it left Russia.
According to British historian A. J. P. Taylor, writing in 1954: <blockquote>"If the treaty of San Stefano had been maintained, both the Ottoman Empire and Austria-Hungary might have survived to the present day. The British, except for Beaconsfield <nowiki>[</nowiki>Disraeli<nowiki>]</nowiki> in his wilder moments, had expected less and were therefore less disappointed. Salisbury wrote at the end of 1878 'We shall set up a rickety sort of Turkish rule again south of the Balkans. But it is a mere respite. There is no vitality left in them.'"</blockquote>
Since 1990, a number of historians, publicists and journalists in Bulgaria have subjected the Treaty of San Stefano and the entire policy of the Russian Empire on the Eastern question in the 19th century to critical re-evaluation. They argue that the liberation of the Bulgarians was used only as a stepping stone for the subjugation of "Turkish Slavs" and an eventual claim to Constantinople.