This is a list of selected December 9 anniversaries that appear in the "On this day" section of the Main Page. To suggest a new item, in most cases, you can be bold and edit this page. Before doing so, please review the selected anniversaries guidelines. If your suggestion is potentially controversial or relates to a day currently or soon to appear on the Main Page, post it on the talk page instead.
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- Events listed on the Main Page are selected based on article quality and to provide a diverse range of topics, rather than solely on the importance or significance of the events.
- Only four or five events are featured each day; therefore, not all important or significant events can be included.
- An event is generally excluded if it is already the subject of the scheduled featured article or picture of the day.
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December 9: Independence Day in Tanzania (1961); Army Day in Peru
- 1425 – Pope Martin V issued a papal bull establishing what later became the Catholic University of Leuven (Arenberg Castle pictured), the largest, oldest and most prominent university in Belgium.
- 1905 – Legislation establishing state secularism in France was passed by the Chamber of Deputies of France, triggering civil disobedience by French Catholics.
- 1979 – A World Health Organization commission of eminent scientists certified the global eradication of smallpox, making it the only human infectious disease to date to have been completely eradicated from nature.
- 1990 – Lech Wałęsa became the first person elected President of Poland in a direct presidential election after the collapse of communism across Eastern Europe.
- 2008 – Governor of Illinois Rod Blagojevich was arrested for a number of corruption crimes, including attempting to sell the U.S. Senate seat that was being vacated by then-U.S. President-elect Barack Obama.
More anniversaries: