| 74491 | June 30 | Event | 1986 – The U.S. Supreme Court rules in Bowers v. Hardwick that states can outlaw homosexual acts between consenting adults. |
| 74492 | June 30 | Event | 1990 – East Germany and West Germany merge their economies. |
| 74493 | June 30 | Event | 1997 – The United Kingdom transfers sovereignty over Hong Kong to the People's Republic of China. |
| 74494 | June 30 | Event | 2013 – Mass protests are held in Egypt. |
| 74495 | June 30 | Event | 2013 – 19 firefighters die controlling a wildfire in Yarnell, Arizona. |
| 74496 | June 30 | Event | 2015 – A Hercules C-130 military aircraft with 113 people onboard crashes in a residential area in the Indonesian city of Medan, resulting in at least 116 deaths. |
| 74497 | June 30 | Birth | 1286 – John de Warenne, 7th Earl of Surrey, English politician (d. 1347) |
| 74498 | June 30 | Birth | 1470 – Charles VIII of France (d. 1498) |
| 74499 | June 30 | Birth | 1503 – John Frederick I, Elector of Saxony (d. 1554) |
| 74500 | June 30 | Birth | 1588 – Giovanni Maria Sabino, Italian organist, composer, and educator (d. 1649) |
| 74501 | June 30 | Birth | 1641 – Meinhardt Schomberg, 3rd Duke of Schomberg, German-English general (d. 1719) |
| 74502 | June 30 | Birth | 1685 – John Gay, English poet and playwright (d. 1732) |
| 74503 | June 30 | Birth | 1755 – Paul François Jean Nicolas, vicomte de Barras, French soldier and politician (d. 1829) |
| 74504 | June 30 | Birth | 1789 – Horace Vernet, French painter and academic (d. 1863) |
| 74505 | June 30 | Birth | 1791 – Félix Savart, French physicist and psychologist (d. 1841) |
| 74506 | June 30 | Birth | 1801 – Frédéric Bastiat, French economist and theorist (d. 1850) |
| 74507 | June 30 | Birth | 1803 – Thomas Lovell Beddoes, English poet, playwright, and physician (d. 1849) |
| 74508 | June 30 | Birth | 1807 – Friedrich Theodor Vischer, German author, poet, and playwright (d.1887) |
| 74509 | June 30 | Birth | 1817 – Joseph Dalton Hooker, English botanist and explorer (d. 1911) |
| 74510 | June 30 | Birth | 1823 – Dinshaw Maneckji Petit, Indian businessman (d. 1901) |
| 74511 | June 30 | Birth | 1843 – Ernest Mason Satow, English orientalist and diplomat (d. 1929) |
| 74512 | June 30 | Birth | 1864 – Frederick Bligh Bond, English architect and archaeologist (d. 1945) |
| 74513 | June 30 | Birth | 1883 – Johan Olin, Finnish wrestler (d. 1928) |
| 74514 | June 30 | Birth | 1884 – Georges Duhamel, French author and critic (d. 1966) |
| 74515 | June 30 | Birth | 1889 – Archibald Frazer-Nash, English motor car designer, engineer and founder of Frazer Nash (d. 1965) |
| 74516 | June 30 | Birth | 1890 – Paul Boffa, Maltese physician and politician, 5th Prime Minister of Malta (d. 1962) |
| 74517 | June 30 | Birth | 1891 – Man Mountain Dean, American wrestler and sergeant (d. 1953) |
| 74518 | June 30 | Birth | 1891 – Ed Lewis, American wrestler and manager (d. 1966) |
| 74519 | June 30 | Birth | 1892 – Pierre Blanchar, Algerian-French actor and director (d. 1963) |
| 74520 | June 30 | Birth | 1892 – Bo Carter, American singer-songwriter and guitarist (Mississippi Sheiks) (d. 1962) |