| Date | Event |
|---|---|
| October 05 1921 | First Broadcast Of The World Series |
| October 08 1921 | KDKA Makes First Live Football Broadcast |
| October 13 1921 | Turkey-USSR Border Established By Treaty |
| October 18 1921 | CASSR Becomes Part Of Soviet Republic |
| October 19 1921 | Portuguese PM Granjo Murdered In Lisbon Coup |
| October 21 1921 | President Harding Gives First Speech |
| October 21 1921 | Valentino's The Sheik Debuts |
| October 26 1921 | The Chicago Theatre Opens |
| October 29 1921 | Link River Dam Completed |
| October 29 1921 | Second Trial Of Sacco And Vanzetti Begins |
| October 29 1921 | Harvard Loss Snaps 25-game Win Streak |