Below is a list of events that happened on September 28:
- 1066 – England was invaded by William the Conqueror, who claimed the English throne.
- 1789 – The first Federal Congress passed a resolution that asked President George Washington to recommend to the nation a day of thanksgiving.
- 1850 – The American Navy abolished flogging as a form of punishment.
- 1906 – US troops reoccupied Cuba, stayed until 1909.
- 1918- The first major outbreak of the Spanish flu in the world. Approximately 30 million people died.
- 1924 – The first flight flew around the world.
- 1928 – Alexander Fleming discovered Penicillin.
- 1939 – Germany and the Soviet Union agreed upon a plan for the division of Poland during World War II.
- 1950 – The United Nations admitted Indonesia.
- 1961 – The United Arab Republic was dissolved.
- 1978 – Pope John Paul I died.
- 1978 – Heavy fighting occurred in Lebanon between Syrian peacekeeping troops and Lebanese Christian militiamen.
- 1991 – UN weapons inspectors ended a 5-day standoff with Iraq.
- 2000 – The U.S. Federal Drug Administration approved the use of RU-486, a drug used to induce abortion.
- 2004 – The American Federal Reserve and the U.S. Secret Service introduced the first newly redesigned $50 bill.
- 2008 – Falcon 1, the first privately funded spacecraft was launched into space.
- 2015 – Flowing water was discovered on Mars by NASA scientists.
- 2018 – Up to 50 million Facebook accounts were hacked due to code weakness.
- 2018 – Famous footballer Cristiano Ronaldo was accused of rape in 2009 in a US lawsuit filed in Nevada.
- 2019 – Hurricane Lorenzo became the first category 5 storm to be recorded so far north and east.