June 30
- 350 – Roman usurper Nepotianus, of the Constantinian dynasty, is defeated and killed by troops of the usurper Magnentius, in Rome.
- 1422 – Battle of Arbedo between the duke of Milan and the Swiss cantons.
- 1520 – Spanish conquistadors led by Hernán Cortés fight their way out of Tenochtitlan.
- 1559 – King Henry II of France is mortally wounded in a jousting match against Gabriel de Montgomery.
- 1651 – The Deluge: Khmelnytsky Uprising – the Battle of Beresteczko ends with a Polish victory.
- 1688 – The Immortal Seven issue the Invitation to William (continuing the English rebellion from Rome), which would culminate in the Glorious Revolution.
- 1758 – Seven Years' War: The Battle of Domstadtl takes place.
- 1794 – Native American forces under Blue Jacket attack Fort Recovery.
- 1805 – The U.S. Congress organizes the Michigan Territory.
- 1859 – French acrobat Charles Blondin crosses Niagara Falls on a tightrope.
- 1860 – The 1860 Oxford evolution debate at the Oxford University Museum of Natural History takes place.
- 1864 – U.S. President Abraham Lincoln grants Yosemite Valley to California for "public use, resort and recreation".
- 1882 – Charles J. Guiteau is hanged in Washington, D.C. for the assassination of U.S. President James Garfield.
- 1886 – The first transcontinental train trip across Canada departs from Montreal. It arrives in Port Moody, British Columbia on July 4.
- 1905 – Albert Einstein publishes the article "On the Electrodynamics of Moving Bodies", in which he introduces special relativity.
- 1906 – The United States Congress passes the Meat Inspection Act and Pure Food and Drug Act.
- 1908 – The Tunguska event occurs in remote Siberia.
- 1912 – The Regina Cyclone hits Regina, Saskatchewan, killing 28. It remains Canada's deadliest tornado event.
- 1921 – U.S. President Warren G. Harding appoints former President William Howard Taft Chief Justice of the United States.
- 1934 – The Night of the Long Knives, Adolf Hitler's violent purge of his political rivals in Germany, takes place.
- 1935 – The Senegalese Socialist Party holds its first congress.
- 1936 – Emperor Haile Selassie of Abyssinia appeals for aid to the League of Nations against Italy's invasion of his country.
- 1941 – World War II: Operation Barbarossa – Germany captures Lviv, Ukraine.
- 1944 – World War II: The Battle of Cherbourg ends with the fall of the strategically valuable port to American forces.
- 1953 – The first Chevrolet Corvette rolls off the assembly line in Flint, Michigan.
- 1956 – A TWA Super Constellation and a United Airlines DC-7 (Flight 718) collide above the Grand Canyon in Arizona, United States, killing all 128 on board the two planes.
- 1959 – A United States Air Force F-100 Super Sabre from Kadena Air Base, Okinawa, crashes into a nearby elementary school, killing 11 students plus six residents from the local neighborhood.
- 1960 – Congo gains independence from Belgium.
- 1963 – Ciaculli massacre: a car bomb, intended for Mafia boss Salvatore Greco, kills seven between police officers and military personnel near Palermo.
- 1968 – Pope Paul VI issues the Credo of the People of God.
- 1969 – Nigeria bans Red Cross aid to Biafra.
- 1971 – The crew of the Soviet Soyuz 11 spacecraft are killed when their air supply escapes through a faulty valve.
- 1971 – Ohio ratifies the 26th Amendment to the U.S. Constitution, lowering the voting age to 18, thereby putting the amendment into effect.
- 1972 – The first leap second is added to the UTC time system.
- 1977 – The Southeast Asia Treaty Organization disbands.
- 1985 – Thirty-nine American hostages from the hijacked TWA Flight 847 are freed in Beirut after being held for 17 days.
- 1986 – The U.S. Supreme Court rules in Bowers v. Hardwick that states can outlaw homosexual acts between consenting adults.
- 1987 – The Royal Canadian Mint introduces the $1 coin, known as the Loonie.
- 1990 – East Germany and West Germany merge their economies.
- 1991 – 32 miners are killed when a coal mine catches fire in the Donbass region of Ukraine and releases toxic gas.
- 1992 – Former Prime Minister Margaret Thatcher joins the House of Lords as Baroness Thatcher.
- 1997 – The United Kingdom transfers sovereignty over Hong Kong to the People's Republic of China.
- 2009 – Yemenia Flight 626 crashes into the Indian Ocean, near Comoros, killing all but one of the 153 passengers and crew on board.
June 29
- 226 – Cao Pi dies after an illness; his son Cao Rui succeeds him as emperor of the Kingdom of Wei.
- 1149 – Raymond of Poitiers is defeated and killed at the Battle of Inab by Nur ad-Din Zangi.
- 1194 – Sverre is crowned King of Norway.
- 1444 – Skanderbeg defeats an Ottoman invasion force at Torvioll.
- 1534 – Jacques Cartier is the first European to reach Prince Edward Island.
- 1613 – The Globe Theatre in London, England burns to the ground.
- 1644 – Charles I of England defeats a Parliamentarian detachment at the Battle of Cropredy Bridge, the last battle won by an English King on English soil.
- 1659 – At the Battle of Konotop the Ukrainian armies of Ivan Vyhovsky defeat the Russians led by Prince Trubetskoy.
- 1786 – Alexander Macdonell and over five hundred Roman Catholic highlanders leave Scotland to settle in Glengarry County, Ontario.
- 1807 – Russo-Turkish War: Admiral Dmitry Senyavin destroys the Ottoman fleet in the Battle of Athos.
- 1850 – Autocephaly officially granted by the Ecumenical Patriarchate of Constantinople to the Church of Greece.
- 1864 – Ninety-nine people are killed in Canada's worst railway disaster near St-Hilaire, Quebec.
- 1874 – Greek politician Charilaos Trikoupis publishes a manifesto in the Athens daily Kairoi entitled "Who's to Blame?" in which he lays out his complaints against King George. He is elected Prime Minister of Greece the next year.
- 1880 – France annexes Tahiti.
- 1889 – Hyde Park and several other Illinois townships vote to be annexed by Chicago, forming the largest United States city in area and second largest in population.
- 1895 – Doukhobors burn their weapons as a protest against conscription by the Tsarist Russian government.
- 1914 – Jina Guseva attempts to assassinate Grigori Rasputin at his home town in Siberia.
- 1916 – The Irish Nationalist and British diplomat Sir Roger Casement is sentenced to death for his part in the Easter Rising.
- 1922 – France grants 1 km² at Vimy Ridge "freely, and for all time, to the Government of Canada, the free use of the land exempt from all taxes".
- 1926 – Arthur Meighen returns to office as Prime Minister of Canada.
- 1927 – First test of Wallace Turnbull's controllable pitch propeller.
- 1928 – The Outerbridge Crossing and Goethals Bridge in Staten Island, New York are both opened.
- 1945 – Carpathian Ruthenia is annexed by the Soviet Union.
- 1950 – In one of the greatest upsets in sports history, the United States defeats England during the 1950 FIFA World Cup.
- 1956 – The Federal-Aid Highway Act of 1956 is signed, officially creating the United States Interstate Highway System.
- 1972 – The U.S. Supreme Court rules in the case Furman v. Georgia that arbitrary and inconsistent imposition of the death penalty violates the Eighth and Fourteenth Amendments, and constitutes cruel and unusual punishment.
- 1974 – Isabel Perón is sworn in as the first female President of Argentina. Her husband, President Juan Peron, had delegated responsibility due to weak health and died two days later.
- 1974 – Mikhail Baryshnikov defects from the Soviet Union to Canada while on tour with Bolshoi Ballet.
- 1976 – The Seychelles become independent from the United Kingdom.
- 1995 – Space Shuttle program: STS-71 Mission (Atlantis) docks with the Russian space station Mir for the first time.
- 1995 – The Sampoong Department Store collapses in the Seocho-gu district of Seoul, South Korea, killing 501 and injuring 937.
- 2002 – Naval clashes between South Korea and North Korea lead to the death of six South Korean sailors and sinking of a North Korean vessel.
- 2006 – Hamdan v. Rumsfeld: The U.S. Supreme Court rules that President George W. Bush's plan to try Guantanamo Bay detainees in military tribunals violates U.S. and international law.
- 2007 – Two car bombs are found at Piccadilly Circus, in the heart of London.
June 28
- 1098 – Fighters of the First Crusade defeat Kerbogha of Mosul.
- 1461 – Edward IV is crowned King of England.
- 1519 – Charles V is elected Emperor of the Holy Roman Empire.
- 1635 – Guadeloupe becomes a French colony.
- 1651 – The Battle of Beresteczko between Poland and Ukraine starts.
- 1763 – A massive earthquake occurs on the same day in Komárom in Hungary, in Komárno in Slovakia and in Zsámbék in Hungary.
- 1776 – American Revolutionary War: Fort Moultrie is attacked during the Battle of Sullivan's Island; this event is commemorated in Carolina Day.
- 1776 – American Revolutionary War: Thomas Hickey, Continental Army private and bodyguard to General George Washington, is hanged for mutiny and sedition.
- 1778 – American Revolutionary War: Battle of Monmouth is fought between the American Continental Army under George Washington and the British Army led by Sir Henry Clinton.
- 1807 – Second British invasion of the Río de la Plata; John Whitelock lands at Ensenada on an attempt to recapture Buenos Aires and is defeated by the locals.
- 1816 – Execution of participants in the Ely and Littleport riots 1816.
- 1838 – Coronation of Victoria of the United Kingdom.
- 1841 – The Paris Opera Ballet premieres Giselle in the Salle Le Peletier
- 1846 – The saxophone is patented by Adolphe Sax in Paris, France.
- 1859 – The first conformation dog show is held in Newcastle-upon-Tyne, England.
- 1865 – The Army of the Potomac is disbanded.
- 1880 – The Australian bushranger Ned Kelly is captured at Glenrowan.
- 1881 – Secret treaty between Austria and Serbia.
- 1882 – The Anglo-French Convention of 1882 marks the territorial boundaries between Guinea and Sierra Leone.
- 1883 – In Milan in Italy inaugurated the first central European electricity power station.
- 1894 – Labor Day becomes an official US holiday.
- 1895 – El Salvador, Honduras and Nicaragua form the Greater Republic of Central America.
- 1895 – Court of Private Land Claims rules James Reavis' claim to Barony of Arizona is "wholly fictitious and fraudulent".
- 1896 – An explosion in the Newton Coal Company's Twin Shaft Mine in Pittston City, Pennsylvania results in a massive cave-in that kills 58 miners.
- 1902 – The U.S. Congress passes the Spooner Act, authorizing President Theodore Roosevelt to acquire rights from Colombia for the Panama Canal.
- 1904 – The SS Norge runs aground and sinks
- 1914 – Franz Ferdinand, Archduke of Austria and his wife Sophie are assassinated in Sarajevo by young Serbian nationalist Gavrilo Princip, the casus belli of World War I.
- 1919 – The Treaty of Versailles is signed in Paris, formally ending World War I between Belgium, Britain, France, Italy, the United States and allies on the one side and Germany and Austria-Hungary on the other side.
- 1921 – Serbian King Alexander I proclaimed the new constitution of the Kingdom of Serbs, Croats and Slovenes, known thereafter as the Vidovdan Constitution.
- 1922 – The Irish Civil War begins with the shelling of the Four Courts in Dublin by Free State forces.
- 1936 – The Japanese puppet state of Mengjiang is formed in northern China.
- 1940 – Romania cedes Bessarabia (current-day Moldova) to the Soviet Union.
- 1942 – Nazi Germany started its strategic summer offensive against the Soviet Union, codenamed Case Blue
- 1948 – The Cominform circulates the "Resolution on the situation in the Communist Party of Yugoslavia"; Yugoslavia is expelled from the Communist bloc.
- 1948 – Boxer Dick Turpin beats Vince Hawkins at Villa Park in Birmingham to become the first black British boxing champion in the modern era.
- 1950 – Seoul is captured by North Korean troops.
- 1956 – in Poznań, workers from HCP factory went to the streets, sparking one of the first major protests against communist government both in Poland and Europe.
- 1964 – Malcolm X forms the Organization of Afro-American Unity.
- 1967 – Israel annexes East Jerusalem.
- 1969 – Stonewall Riots begin in New York City marking the start of the Gay Rights Movement.
- 1973 – Elections are held for the Northern Ireland Assembly, which will lead to power-sharing between unionists and nationalists in Northern Ireland for the first time.
- 1976 – The Angolan court sentenced US and UK mercenaries to death sentences and prison terms in the Luanda Trial.
- 1978 – The United States Supreme Court, in Regents of the University of California v. Bakke bars quota systems in college admissions.
- 1980 – Launch of independent radio station, Channel 702 ( Now called Radio 702 ) in Bophuthatswana, now based in Johannesburg, South Africa.
- 1981 – A powerful bomb explodes in Tehran, killing 73 officials of Islamic Republic Party.
- 1983 – The Mianus River Bridge collapses over the Mianus River in Connecticut, killing 3 drivers in their vehicles.
- 1989 – The 600th anniversary of the Battle of Kosovo. Serbian leader Slobodan Milošević delivers the Gazimestan speech at the site of the historic battle.
- 1990 – Paperback Software International Ltd. is found liable by a U.S. court for copyright violation for copying the appearance and menu system of Lotus 1-2-3 in its competing spreadsheet program.
- 1992 – The Constitution of Estonia is signed into law.
- 1994 – Members of the Aum Shinrikyo cult release sarin gas in Matsumoto, Japan; 7 persons are killed, 660 injured.
- 1996 – The Constitution of Ukraine is signed into law.
- 1997 – Mike Tyson vs. Evander Holyfield II – Tyson is disqualified in the 3rd round for biting a piece off Holyfield's ear.
- 2001 – Slobodan Milošević deported to ICTY to stand trial.
- 2004 – Sovereign power is handed to the interim government of Iraq by the Coalition Provisional Authority, ending the U.S.-led rule of that nation.
- 2005 – War in Afghanistan: Three U.S. Navy SEALs and 16 American Special Operations Forces soldiers are killed during Operation Red Wing, a failed counter-insurgent mission in Kunar province, Afghanistan.
- 2006 – Montenegro is admitted as the 192nd Member of the United Nations by General Assembly
