Mihkel Martna (17 September 1860 Veltsa parish, Paimpere – 23 May 1934 Tallinn) was an Estonian politician and journalist. Martna was born in Kreis Wiek in the Governorate of Estonia (in present-day Pärnu County) and studied in a local village school. Thereafter, he worked as country labourer before going to Tallinn in order to become house painter. At this period, he became acquainted with the European workers' movement, socialism and Marxism. As he was one of the first Estonians to be active in this field, he came to be called "the father of Estonian social democracy". As a young man, he was also active in Estonian national movement, publishing articles in Postimees and Sakala and collecting folklore material.