| British Black History Month | October |
| International Dinosaur Month | October |
| Diversity Awareness Month | October |
| National Book Month | October |
| National Cyber Security Month | October |
| National Dental Hygiene Month | October |
| Adopt a Shelter Dog Month | October |
| National Popcorn Month | October |
| National Stamp Collecting Month | October |
| Computer Learning Month | October |
| Yosemite Park Established | Oct 1, 1890 |
| Disney World Opens | Oct 1, 1971 |
| China National Day | Oct 1, 2009 |
| Mahatma Gandhi's Birthday | Oct 2, 1869 |
| East and West Germany Reunite | Oct 3, 1990 |
| Sputnik Anniversary | Oct 4, 1957 |
| Mystery Series Week | Oct 4-10, 2009 |
| Fire Prevention Week | Oct 4-10, 2009 |
| National Metric Week | Oct 4-10, 2009 |
U.S. Supreme Court Opens First Monday of October | Oct 5, 2009 |
| Mad Hatter Day | Oct 6, 2009 |
| The Great Chicago Fire Began | Oct 8, 1871 |
| John Lennon's Birthday | Oct 9, 1940 |
Pledge of Allegiance created to celebrate 400 Years Since Columbus' Arrival | Oct 12, 1892 |
| Columbus Day | Oct 12, 2009 |
| Anniversary of Columbus Arrival in the New World | Oct 12, 1492 |
| World Population Reaches 6 Billion | Oct 12, 1999 |
| World Rainforest Week | Oct 12-18, 2009 |
| Martin Luther King Receives Nobel Prize | Oct 14, 1964 |
| Winnie-the-Pooh Published | Oct 14, 1926 |
| Statue of Liberty Designated a National Monument | Oct 15, 1924 |
| Noah Webster's Birthday, Celebrated Annually as Dictionary Day | Oct 16, 1758 |
| Marie Antoinette Beheaded | Oct 16, 1793 |
| U.S. Population Reaches 300 Million | Oct 17, 2006 |
| Red Ribbon Week | Oct 17-25, 2009 |
| Transfer of Alaska From Russia to U.S., Celebrated as Alaska Day | Oct 18, 1867 |
| Teen Read Week | Oct 18-24, 2009 |
| National Chemistry Week | Oct 18-24, 2009 |
| National Teen Driver Safety Week | Oct 18-24, 2009 |
| First Landfall of Hurricane Wilman | Oct 21, 2005 |
| Edison Invents the Incandescent Light Bulb | Oct 21, 1879 |
| Orionids Meteor Shower | Oct 21, 2009 |
| Chemists Celebrate National Mole Day | Oct 23, 2009 |
| Pablo Picasso's Birthday | Oct 25, 1881 |
| Jonas Salk's Birthday | Oct 28, 1914 |
Digital Millennium Copyright Act of 1998 Signed Into Law | Oct 28, 1998 |
| Statue of Liberty Dedicated | Oct 28, 1886 |
| First Internet Transmission | Oct 29, 1969 |
| Stock Market Crash | Oct 29, 1929 |
| Captain Thomas Preston Acquitted in Boston Massacre Trial | Oct 30, 1770 |
| John Adams' Birthday | Oct 30, 1735 |
| Harry Houdini's Death | Oct 31, 1926 |
| Halloween Recipes | Oct 31, 2009 |
| Halloween Costumes | Oct 31, 2009 |
| Halloween Pumpkin Carving | Oct 31, 2009 |
| Fun Halloween | Oct 31, 2009 |
| National Magic Day | Oct 31, 2009 |
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