This is a list of selected January 23 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. Please read the selected anniversaries guidelines before making your edit. However, if your addition might be controversial or on a day that is or will soon be on the Main Page, please post your suggestion on the talk page instead.
Please note that the events listed on the Main Page are chosen based more on relative article quality and to maintain a mix of topics, not based solely on how important or significant their subjects are. Only four to five events are posted at a time and thus not everything that is "most important and significant" can be listed. In addition, an event is generally not posted this year if it is also the subject of the scheduled featured article or picture of the day.
To report an error when this appears on the Main Page, see Main Page errors. Please remember that this list defers to the supporting articles, so it is best to achieve consensus and make any necessary changes there first.
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- 393 – Roman Emperor Theodosius I (likeness pictured) proclaimed his nine-year-old son Honorius co-emperor.
- 1789 – Bishop John Carroll purchased a plot of land that would be the home of the future Georgetown University, the oldest Catholic University in the United States.
- 1793 – The Russian Empire and the Kingdom of Prussia partitioned the Polish–Lithuanian Commonwealth for the second time.
- 1899 – Pursuant to the adoption of the Malolos Constitution and the establishment of the First Philippine Republic, Emilio Aguinaldo was sworn in as the first President of the Philippines.
- 1968 – USS Pueblo was seized by North Korean forces, who claimed that it had violated their territorial waters while spying.