Treaty of Bucharest, 1913

Treaty of Bucharest

Borders of the Balkan states after the Treaty of Bucharest (below)
Signed	10 August 1913
Location	Bucharest, Romania
Parties	Bulgaria  Romania  Serbia  Greece  Montenegro

The Treaty of Bucharest (Romanian: Tratatul de la Bucureşti; Serbian: Bukureštanski mir/ Букурештански мир; Bulgarian: Договорът от Букурещ; Greek: Συνθήκη του Βουκουρεστίου) was concluded on 10 August 1913, by the delegates of Bulgaria, Romania, Serbia, Montenegro and Greece. The Treaty was concluded in the aftermath of the Second Balkan War and amended the previous , which ended the First Balkan War. About one month later, the Bulgarians signed a separate border treaty (the ) with the Ottomans, who had regained some territory west of the Enos-Midia Line during the second war.

Bulgaria, dissatisfied with its gains in the First Balkan War, and especially with Greek and Serbian gains in , launched an attack on its former allies in June 1913. The attacks were driven back, and the Greek and Serbian armies invaded Bulgarian-held territory in return. At the same time, the Ottomans advanced into Eastern Thrace and retook Adrianople, while Romania used the opportunity to invade Bulgaria from the north and advance against little opposition to within a short distance of the Bulgarian capital, Sofia. Isolated and surrounded by a more powerful coalition of opponents, Bulgaria was forced to agree to a truce and to peace negotiations to be held in the Romanian capital, Bucharest.

All important arrangements and concessions involving the rectification of the controverted international boundary lines were perfected in a series of committee meetings, incorporated in separate protocols, and formally ratified by subsequent action of the general assembly of delegates. Although the Ottomans had also participated in the Second Balkan War, they were not represented at this treaty. Instead, bilateral treaties were later concluded with Bulgaria () and Greece (Treaty of Athens).