September 8 is the 251st day of the year. 114 days remain until the end of the year.
- 685 – Emperor Xuanzong of Tang (d. 762)
- 1157 – Richard I of England (d. 1199)
- 1209 – Sancho II of Portugal (d. 1248)
- 1633 – Ferdinand IV, King of the Romans (d. 1654)
- 1779 – Mustafa IV, Ottoman sultan (d. 1808)
- 1889 – Robert A. Taft, American lawyer and politician (d. 1953)
- 1932 – Patsy Cline, American singer-songwriter and pianist (d. 1963)
- 1941 – Bernie Sanders, American politician
- 1979 – Pink, American singer-songwriter, producer, and actress
- 1981 – Jonathan Taylor Thomas, American actor
- 701 – Pope Sergius I (b. 650)
- 1100 – Antipope Clement III (b. 1029)
- 1949 – Richard Strauss, German composer and manager (b. 1864)
- 1100 – Election of Antipope Theodoric.
- 1198 – Philip of Swabia, Prince of Hohenstaufen, is crowned King of Germany (King of the Romans)
- 1253 – Pope Innocent IV canonises Stanislaus of Szczepanów, killed by king Bolesław II.
- 1276 – Pope John XXI is chosen.
- 1504 – Michelangelo’s David is unveiled in Piazza della Signoria in Florence.
- 1761 – Marriage of King George III of the United Kingdom to Duchess Charlotte of Mecklenburg-Strelitz.
- 1831 – William IV and Adelaide of Saxe-Meiningen are crowned King and Queen of the United Kingdom of Great Britain and Ireland.
- 1883 – The Northern Pacific Railway (reporting mark NP) was completed in a ceremony at Gold Creek, Montana. Former president Ulysses S. Grant drove in the final “golden spike” in an event attended by rail and political luminaries.
- 1888 – In London, the body of Jack the Ripper’s second murder victim, Annie Chapman, is found.
- 1892 – The Pledge of Allegiance is first recited.
- 1900 – Galveston hurricane: A powerful hurricane hits Galveston, Texas killing about 8,000 people.
- 1921 – Margaret Gorman, a 16-year-old, wins the Atlantic City Pageant’s Golden Mermaid trophy; pageant officials later dubbed her the first Miss America.
- 1930 – 3M begins marketing Scotch transparent tape.
- 1941 – World War II: German forces begin the Siege of Leningrad.
- 1943 – World War II: United States General Dwight D. Eisenhower publicly announces the armistice with Italy.
- 1966 – The landmark American science fiction television series Star Trek premieres with its first-aired episode, “The Man Trap”.
- 1974 – Watergate scandal: US President Gerald Ford signs the pardon of Richard Nixon for any crimes Nixon may have committed while in office.
- International Literacy Day
- National Actors Day
- National Ampersand Day
- National Hug your Hound Day
- National Grandparents Day
- National Pledge of Allegiance Day
- Virgin Mary Day
- Star Trek Day
- World Physical Therapy Day