| December 17th 1920 | | British Empire receives League of Nations mandate to Nauru
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| December 17th 1920 | | AL votes to let spitball pitchers to continue using it
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| December 17th 1922 | | Last British troops leave Ireland Freestate
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| December 17th 1923 | | Greek king George II overthrown by army/republic
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| December 17th 1924 | | 1st US diesel electric locomotive enters service, Bronx, NY
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| December 17th 1925 | | Russia & Turkey sign non-aggresion pact
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| December 17th 1925 | | Col William "Billy" Mitchell court-martial for insubordination
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| December 17th 1926 | | German Marx govt falls due to cooperation with red army
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| December 17th 1926 | | KYA-AM in San Francisco CA begins radio transmissions
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| December 17th 1926 | | Lithuanian military state under gen Augustine Woldemaras
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| December 17th 1927 | | Victoria score 793 against Queensland, Bill Ponsford 437
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| December 17th 1927 | | US sub 'S-4' sinks after collision kills all 34 aboard
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| December 17th 1927 | | Bradman scores 118 on 1st-class cricket debut, 188 mins 8 fours
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| December 17th 1928 | | John McGraw backs NL Pres John Heydler's designated hitter idea
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| December 17th 1932 | | Cards trade Jim Bottomley to Reds for Estel Crabtree & Ownie Carroll
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