Parliamentary elections were held in Finland on 17 March 1991, the first time a Finnish parliamentary election had been held on a single day.[1][2] For the first time since 1962 the Social Democratic Party was displaced as the largest party in the Eduskunta, with the Centre Party winning 55 seats and forming the first centre-right, non-social democratic government since 1964,[3] with Esko Aho as Prime Minister.