Stefan Nikolov Stambolov (Bulgarian: Стефан Николов Стамболов) ( 31 January 1854 – 6 July 1895) was a Bulgarian politician, who served as Prime Minister and regent. He is considered one of the most important and popular "Founders of Modern Bulgaria", and is sometimes referred to as "the Bulgarian Bismarck".
Stambolov was born in Veliko Tarnovo. His father took part in the "Velchova Zavera" plot against Turkish rule in 1835. His education started in his home town, but he later studied in the Seminary of Odessa in 1870-1872. He joined the Bulgarian Revolutionary Central Committee (BRCC). After the death of BRCC founder Vassil Levski, Stambolov was chosen as his successor. He was the leader of the unsuccessful uprising in Stara Zagora (1875) and the Turnovo revolutionary committee in the great uprising of April 1876.
Stambolov was involved in the political discussions as early as the time of the first Bulgarian parliament - the "Founding Assembly" of 1879. After 1880 he became the vice-chairman and later the chairman of the Narodno Subranie (the Bulgarian parliament). In 1885, he helped bring about the union of Bulgaria and Eastern Rumelia.