Georgi Iordanov Kirkov (Bulgarian: Георги Йорданов Кирков; August 1867 – 25 August 1919), also known by the name Master (Майстора), was a prominent Bulgarian socialist politician and writer, one of the founders of the Bulgarian Workers’ Social Democratic Party (Narrow Socialists) (BWSDP[NS]). From 1879 to 1886, Kirkov studied in Russia, where he became familiar with the works of the Russian revolutionary democrats and with underground Narodnik (Populist) literature. From 1886 to 1892 he lived in Bulgaria, and from 1892 to 1895 he studied in Vienna, where he took part in the Austrian labor move