March 1 - Johnny Cash, 36 years of age, marries June Carter, 38 years of age.
March 2 - World Ladies Figure Skating Championship in Geneva is won by USA’s Peggy Fleming.
March 4 - Joe Frazier TKOs Buster Mathis in 11 rounds for heavyweight boxing title.
March 4 - Martin Luther King, Jr announces plans for Poor People's Campaign.
March 5 - U.S. launches Solar Explorer B, also known as Explorer 37 from Wallops Island to study the Sun.
March 7 - Jeff Kent, second baseman for the Dodgers is born in Bellflower, CA.
March 7 - The First Battle of Saigon begins in Viet Nam.
March 8 - Bill Graham opens the Fillmore East in an abandoned movie theater in New York City.
March 10 - A Ferry boat sinks in the harbor of Wellington New Zealand killing 200.
March 11 - Lisa Loeb is born.
March 11 - Dmitri Shostakovich completes his 12th string quartet, in D flat major (Op. 133).
March 11 - Otis Redding posthumously receives a gold record for "(Sittin' On) the Dock of the Bay."
March 12 - Mauritius achieves independence from British Rule.
March 12 - President Lyndon B. Johnson edges out antiwar candidate Eugene J. McCarthy in the New Hampshire Democratic primary, a vote which highlights the deep divisions over Vietnam War in the U.S.
March 13 - The Beatles release the single "Lady Madonna" in the UK.
March 14 - Nerve gas leaks from the U.S. Army Dugway Proving Ground near Skull Valley, Utah. Sickening sheep on local ranches coincided with several open-air tests of the extremely toxic nerve agent VX at Dugway. The Army, which initially denied that VX had caused the deaths, never admitted liability, though they did pay the ranchers for their losses. On the official record, the claim was for 4,372 "disabled" sheep, of which about 2,150 died.
March 14 - CBS TV suspends Radio Free Europe free advertising because RFE doesn't make it clear it is sponsored by the CIA.
March 15 - Diocese of Rome announces that it "deplored the concept", but wouldn't prohibit rock & roll masses at the Church of San Lessio Falconieri.
March 15 - LIFE magazine, in an article, calls Jimi Hendrix "the most spectacular guitarist in the world."
March 16 - In My Lai, South Vietnam, American troops massacre between 350 and 500 unarmed Vietnamese villagers - men, women, and children.
March 16 - General Motors releases its 100 millionth automobile, the Oldsmobile Toronado.
March 16 - Italian composer Mario Castelnuovo-Tedesco dies at the age of 73.
March 16 - Democratic Senator from New York, Robert F. Kennedy announces he’ll run for the Presidency.
March 17 - A demonstration in London's Grosvenor Square against U.S. involvement in the Vietnam War leads to violence - 91 police injured, 200 demonstrators arrested.
March 18 - The U.S. Congress repeals the requirement for a gold reserve to back US currency.
March 19-March 23 - Students at Howard University in Washington, D.C., seize the administration building and stage a five-day sit-in, shutting down the university in protest over its ROTC program, and demanding a more Afro-centric curriculum.
March 20 - Carl Theodor Dreyer, Danish director of The Passion of Jeanne d'Arc (1928) and The Vampire (1932), dies of pneumonia in Copenhagen at age 79.
March 22 - Daniel Cohn-Bendit and seven other students occupy Administrative offices of Nanterre, leading to the closure of the University on May 2, which in turn helped move the protests to downtown Paris where the May 1968 Student Riots launch France into a deep state of chaos.
March 23- Edwin O'Connor, American novelist and Pulitzer Prize winner dies.
March 23 – UCLA beats North Carolina 78-55 in the 30th Annual NCAA Men's Basketball Championship.
March 24 - Alice Guy-Blaché, pioneering filmmaker who was the first female director in the motion picture industry dies at the age of 94.
March 25 - The 58th and final new episode of The Monkees airs on NBC.
March 26 – R&B artist Little Willie John, he sang the original version of "Fever" and "Talk to Me," dies at Walla Walla State Prison in Washington. He had been imprisoned for stabbing a man to death in October 1964. The official cause of death is listed as a heart attack, though some reports say he died of pneumonia or asphyxiation.
March 27 - Yuri Gagarin, Soviet Cosmonaut and first human in space, dies in aircraft training accident.
March 29 - Lucy Lawless, New Zealand actress best known for her role as Xena is born.
March 29 - Students at Bowie State College seize the administration building to protest the run-down condition of their campus, at a time when Maryland essentially ran separate college systems for black and white students. Instead of negotiating, Governor Spiro Agnew sent the state police in to take back the administration building.
March 30 -The Yardbirds record their live album at the Anderson Theater in New York City. Though at first it was shelved by the band, once Led Zeppelin hit big, Epic Records tried to cash in by releasing the material as the bootleg Live Yardbirds: Featuring Jimmy Page. It was quickly withdrawn after Page's lawyers filed an injunction on the record.
March 30 - Bobby Driscoll, Academy Award winning child actor, dies from a heart attack brought on by liver failure and advanced arteriosclerosis due to his long-time drug abuse at the age of 31. Believed to be an unclaimed and homeless person, he was buried in an unmarked pauper's grave on Hart Island where he still remains today.
March 31 - Seattle's first Major League Baseball team is named the Pilots.
March 31 - President Lyndon B. Johnson announces he will not run for re-election.