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| 1920, Dec. 16 |
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| Finland joined the League of Nations. | 1 |
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| 1921, June 24 |
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| The League council assigned to Finland sovereignty over the Aaland Islands, on condition that the islands be given an autonomous regime. | 2 |
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| 1923 |
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| The University of Helsinki became a bilingual institution in an attempt to ease tension between the Swedish and Finnish linguistic communities. | 3 |
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| 1925 |
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| Jean Sibelius (1865–1957), composer, wrote his last major work, Tapiola. Sibelius was hailed as a national treasure in Finland, where his birthdays were national celebrations. | 4 |
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| Feb. 16 |
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| LAURI RELANDER succeeded Stahlberg as president. | 5 |
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