Nikolai Frantsevich Danielson (Russian: Никола́й Фра́нцевич Дание́льсон; also known as N-on, Nik-on, Nikolai-on; 7 February 1844, Moscow – 13 July 1918, Petrograd) was a Russian socio-political figure, economist, publicist, and one of the theoreticians of liberal populism. He is also famous for his translations of Das Kapital by Marx, and being a writer on Russian economic development.