1928 (MCMXXVIII) was a leap year starting on Sunday in the Gregorian calendar. It was a leap year starting on Saturday in the Julian calendar and a common year starting on Monday of the obsolete Julian calendar. It was also the last year when the Julian calendar was used until Tuesday, January 1, 1929, when every state in the entire world had adopted the Gregorian calendar.
- January 31 – Leon Trotsky is exiled to Kazakhstan
- February 8 – British inventor John Logie Baird sends the first television signal across the Atlantic Ocean, from London to New York
- May 7 – The United Kingdom gives equal voting rights to women by passing the Representation of the People Act. This law allows women to vote when they are 21 years old, like men. Before this, women could not vote until they were 30.
- June 9 – Australian flyer Charles Kingsford Smith finishes the first airplane flight across the Pacific Ocean.
- September 28 – Scottish scientist Alexander Fleming discovers penicillin
- October 2 – Josemaria Escriva starts Opus Dei.
|Centuries:||19th century – 20th century – 21st century|
|Decades:||1890s 1900s 1910s – 1920s – 1930s 1940s 1950s|
|Years:||1925 1926 1927 – 1928 – 1929 1930 1931|
- January 5 – Zulfiqar Ali Bhutto, 9th Prime Minister of Pakistan and 4th President (died 1979).
- March 20 – Fred Rogers, American television children's program host and writer (died 2003).
- April 23 – Shirley Temple, American child actress and diplomat (died 2014).
- May 4 – Hosni Mubarak, 4th President of Egypt and Prime Minister (died 2020).
- June 14 – Che Guevara, Argentinian Marxist revolutionary (died 1967).
- July 26 – Stanley Kubrick, American movie director (died 1999).
- August 22 – Karlheinz Stockhausen, German composer (died 2007).
- December 1 - Malachi Throne, American television actor (died 2013).
- December 30 – Bo Diddley, American rock and roll musician (died 2008).