Hertta Elina Kuusinen (February 14, 1904, Luhanka – March 18, 1974, Moscow) was a Finnish Communist politician. She was a member of the central committee (1944-?) and the political bureau of the Communist Party of Finland, member of parliament (1945–1972), general secretary (1952–1958) and the leader of the parliamentary group of the Finnish People's Democratic League. Kuusinen was only the second woman in Finland to serve as cabinet minister in 1948. She was the daughter of Finnish communist leader Otto Ville Kuusinen.
Hertta Kuusinen moved to the Soviet Union after her father in the 1920s. She worked for Comintern since 1922, witnessed Hitler's rise in Germany 1932–1933 and taught in the International Lenin School 1933–1934. Kuusinen returned to Finland in 1934 to work underground for the illegal communist party. Instead she ended up in prison for over ten years.
The political climate in Finland changed after World War II, Kuusinen was released and in the first post-war elections in 1945 Kuusinen was elected to the Eduskunta from the Finnish People's Democratic League (SKDL) list. She was General Secretary of the SKDL from 1952 to 1958, when the SKDL became the largest party in the Eduskunta with 50 of 200 seats. She was a member of Parliament until 1972, and also held the record in personal votes (58 770 / 1948) received in parliamentary elections that stood until the 2007 election.
Kuusinen was married to communist politicians Tuure Lehén (1923–1933) and Yrjö Leino (1945–1950).