This is a list of selected September 18 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.
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September 18: Yom Kippur ends at nightfall (Judaism, 2010); Oktoberfest begins (2010); National Day in Chile
- 96 – Following the assassination of Roman Emperor Domitian, the Roman Senate appointed Nerva (bust pictured), the first of the Five Good Emperors, to succeed him.
- 324 – Constantine the Great decisively defeated Licinius in the Battle of Chrysopolis, establishing Constantine's sole control over the Roman Empire, and ultimately leading to the conversion of the whole empire to Christianity.
- 1809 – The second theatre of the Royal Opera House in London opened after a fire destroyed the original theatre one year earlier.
- 1931 – The Mukden Incident: A section of the Japanese-built South Manchuria Railway was destroyed, providing an excuse for the Japanese to blame the act on Chinese dissidents, and thus giving a pretext for the Japanese occupation of Manchuria.
- 1948 – The Donald Bradman-led Australian cricket team completed the unprecedented feat of going through an English summer without defeat.
- 1998 – The Internet Corporation for Assigned Names and Numbers (ICANN), a non-profit organization that manages the assignment of domain names and IP addresses in the Internet, was established.
More anniversaries: