Nikolai Feodorovich Annensky (Russian: Никола́й Фёдорович А́нненский; 12 March 1843 – 8 August 1912) was a Russian economist, statistician and politician. He was a member of the populist (narodnik) movement and the Socialist-Revolutionary Party before becoming one of the founders of the Russian Popular Socialist Party (NSP) in 1906.
Annensky was born in St. Petersburg and attended the University there. When he was young, he lost both of his parents and had to care for his younger siblings, including the future Russian poet Innokenty Annensky. As a student, N.F. Annensky became involved in the revolutionary populist movement. He was also strongly influenced by the writings of N.K. Mikhailovsky. Like Mikhailovsky, Annensky rejected Marxism, which was just beginning to influence the Russian socialist movement, because it seemed to condemn the Russian peasantry to be sacrificed to the development of industrial capitalism. Instead, Annensky desired an agrarian socialism based on the peasant commune. In the 1870s and 80s, Annensky was a major representative of 'Legal Populism' and contributed to such journals as Notes of the Fatherland (Otechestvennye Zapiski) and The Cause (Delo). At the same time, he kept in contact with illegal narodnik circles. In 1880, he was arrested and sentenced to administrative exile. Released in 1883, he worked as a statistician at the Nizhni Novgorod provincial zemstvo, becoming its head in 1887. In 1893, he was involved in founding the 'People's Right' party. In 1895, he became head of the statistical office of the city administration of St. Petersburg. At the same time, he joined the 'Free Economic Society' and the radical 'St. Petersburg Writers Union'. Annensky's work as a statistician enabled him to gather valuable information on the social conditions of workers and peasants in turn-of-the-century Russia.
In 1901, he was arrested and exiled again for participating in an anti-government demonstration. After his release, he lived in Finland, where he was involved in founding the 'Union of Liberation' in 1904 with former Marxists P.B. Struve, S.N. Prokopovich and others. This became the nucleus of the Constitutional-Democratic Party; (Ka-Dets), tsarist Russia's main liberal party. However, Annensky also retained his connections with narodnik socialism and became involved in the Socialist-Revolutionary Party (PSR). He argued strenuously against the PSR's revival of political terrorism as a tactic and deplored the influence of Marxism on its leading theorists, such as V.M. Chernov.