Iisakki Vihtori Kosola (10 July 1884 – 14 December 1936) was the leader of the Finnish right-wing radical Lapua Movement.
Kosola was born in Ylihärmä, Southern Ostrobothnia. His family's farmhouse burnt down the next year, and the family moved to Lapua. His formative years were spent in farming and cattle-breeding.
Kosola was an active recruiter of Finnish Jäger troops to Germany from autumn 1915, and was incarcerated in 1916. He was imprisoned in Helsinki, then at the Shpalernaya prison in St. Petersburg among other Finnish activists. He was released after the Russian Revolution and eagerly took part in the Finnish Civil War against the Red Guards and the Russians. After the war Kosola led the Lapua White Guard.
In the 1920s he organized Vientirauha, a strikebreakers' organisation, in Southern Ostrobothnia. He made a speech at the first meeting of the anti-communist Lapua Movement as it was organized in 1929, and was chosen as its leader as the movement radicalized in the following year. He took part of the abortive Mäntsälä Rebellion of 1932 that ended with the dissolution and banning of the Lapua Movement and the brief imprisonment of Kosola.
Kosola was chosen as president of the Lapua Movement's successor, the Patriotic People's Movement, but as the Movement became more political, Kosola had less time to participate in its affairs in Helsinki.
Kosola's radical right-wing politics caused a common saying in the 1930s: "Heil Hitler, meil Kosola," accented Finnish for "They've got Hitler, we've got Kosola". Sometimes also a third stanza, "muil Mussolini" (the others' Mussolini) was added. Kosola had a sobriquet Kosolini after his charismatic and vivid style of speech similar to Benito Mussolini.
- Viimeistä Piirtoa Myöten, Lapua, 1935 (Memoirs)
- European Right: A Historical Profile edited by Hans Rogger and Eugen Weber, the "Finland" chapter by Marvin Rintala ISBN 1-299-09045-1 and ISBN 0-520-01080-9
- Biographical Dictionary of the Extreme Right Since 1890 edited by Philip Rees, 1991, ISBN 0-13-089301-3
- A biography from Eteläpohjalaisia elämänkertoja, 1963  (Finnish)