Esko Olavi Seppänen (born 15 February 1946 in Oulu) is a Finnish former politician representing the Left Alliance. He was a Member of the European Parliament (MEP) from 1996 to 2009, and a member of the Finnish parliament from 1987 to 1996.
In the European Parliament Seppänen was Member of the Bureau of the European United Left–Nordic Green Left and sat on the European Parliament's Committee on Budgets. He also was a substitute for the Committee on Budgetary Control and the Committee on Industry, Research and Energy.
Seppänen began politics by joining the Social Democratic Youth. In 1974 he joined the Communist Party of Finland. He belonged to the more Eurocommunist majority of the party (as opposed to Taistoist Neo-Stalinist minority). In 1989 Seppänen opposed merging the Communist Party into the new Left Alliance (Vasemmistoliitto), criticizing the procedure as undemocratic. Nevertheless, Esko Seppänen worked in the leadership of the new party until 2001.
Seppänen has a Bachelor's degree in business studies (1971). He worked as journalist at Yleisradio in 1970–1987.