Wikipedia:Selected anniversaries/October 9
October 9: Independence Day in Uganda (1962), Hangul Day in South Korea (1446)
- 1635 - Roger Williams was banished from Massachusetts Bay Colony as a religious dissident after he spoke out against punishments for religious offenses and giving away Native American land.
- 1701 - The Collegiate School of Connecticut (later renamed Yale University) was chartered in Old Saybrook, Connecticut.
- 1888 - The Washington Monument, then the world's tallest building, officially opened to the general public.
- 1919 - Black Sox scandal: The Cincinnati Reds "defeated" the Chicago White Sox to "win" the World Series major league baseball championship by 5 games to 3.
- 1963 - A landslide displaced large amounts of water from the Vajont Dam in Italy, causing waves and floods that quickly swept away several villages, killing almost 2,000 people.