1pm – 6pm ET
March – The Cray-1, the first commercially developed supercomputer, is released by Seymour Cray’s Cray Research, with the first purchaser being the Energy Research and Development Administration (ERDA) in Los Alamos, New Mexico.
U.K. Home Secretary Merlyn Rees ends Special Category Status for those sentenced for scheduled terrorist crimes relating to the civil violence in Northern Ireland.
Bradford Bishop allegedly murders five of his family members in Bethesda, Maryland. The crime goes undiscovered for 10 days and the suspect is never caught. In 2014, he is placed on the FBI’s Ten Most Wanted Fugitives list.
The Maguire Seven are found guilty of possessing explosives and subsequently jailed for 14 years.
The Northern Ireland Constitutional Convention is formally dissolved in Northern Ireland, resulting in direct rule of Northern Ireland from London via the British Parliament.
March 9 – A cable car disaster in Cavalese, Italy leaves 43 dead.
March 9 – March 11 – Two coal mine explosions claim 26 lives at the Blue Diamond Coal Co. Scotia Mine, in Letcher County, Kentucky.
March 14 – After eight years on NBC, The Wizard of Oz returns to CBS, where it will remain until 1999, setting what was likely then a record for the most telecasts of a Hollywood film on a commercial television network. That record is broken by The Ten Commandments in 1996, which began its annual network telecasts on ABC in 1973 and is still (as of 2020) telecast by that network.
March 16 – Harold Wilson resigns as Prime Minister of the United Kingdom.
March 17 – Rubin “Hurricane” Carter is retried in New Jersey.
March 20 – Patty Hearst is found guilty of armed robbery of a San Francisco bank.
March 22 – Star Wars begins filming in Tunisia.
March 23 – Mitsuyasu Maeno attempted to assassinate Yoshio Kodama by flying a plane into his Tokyo house, kamikaze-style.
Argentina military forces depose president Isabel Perón.
A general strike takes place in the People’s Republic of the Congo.
The Toronto Blue Jays are created.
The Body Shop, a well known retail chain of skin care and cosmetic products, opens its first branch in Brighton, England.
The South African Defence Force withdraws from Angola and concludes Operation Savannah.
The first 7.4 kilometres (4.6 mi) of the Washington Metro subway system opens.
March 29 – The military dictatorship of General Jorge Videla comes to power in Argentina.
March 30 – The events which inspired the Land Day took place in Israel
March 31 – The New Jersey Supreme Court rules that patient in a persistent vegetative state in the Karen Ann Quinlan case can be disconnected from her ventilator. She remains comatose and dies in 1985.
Apple Computer Company is formed by Steve Jobs and Steve Wozniak.
Conrail (Consolidated Rails Corporation) is formed by the U.S. government, to take control of 13 major Northeast Class-1 railroads that had filed for bankruptcy protection. Conrail takes control at midnight, as a government-owned and operated railroad until 1986, when it is sold to the public.
The Jovian–Plutonian gravitational effect is first reported by astronomer Patrick Moore.
April 2 – Norodom Sihanouk is forced to resign as Head of State of Kampuchea by the Khmer Rouge led by Pol Pot and is placed under house arrest.
April 3 – The Eurovision Song Contest 1976 is won by Brotherhood of Man, representing the United Kingdom, with their song Save Your Kisses for Me.
James Callaghan becomes Prime Minister of the United Kingdom.
Tiananmen Incident: Large crowds lay wreaths at Beijing’s Monument of the Martyrs to commemorate the death of Premier Zhou Enlai. Poems against the Gang of Four are also displayed, provoking a police crackdown.
Segovia prison break: in Spain’s largest prison break since the Spanish civil war, 29 political prisoners escape from Segovia prison.
Howard Hughes, Millionaire businessman and aviator dies at age 70.
April 10 – Frampton Comes Alive!, the multi-platinum selling live album by English rock musician Peter Frampton hits #1 in the Billboard 200 and remains there for 10 weeks, becoming the best-selling album of the year.
April 11 – Steve Jobs and Steve Wozniak create and release the first apple computer, the Apple 1
The Lapua Cartridge Factory explosion in Lapua, Finland kills 40.
The United States Treasury Department reintroduces the two-dollar bill as a Federal Reserve Note on Thomas Jefferson’s 233rd birthday as part of the United States Bicentennial celebration.
April 16 – As a measure to curb population growth, the minimum age for marriage in India is raised to 21 years for men and 18 years for women.
April 21 – The Great Bookie Robbery in Melbourne: Bandits steal A$1.4 million in bookmakers’ settlements from Queen Street, Melbourne.
The punk rock group the Ramones release their first album, Ramones.
Jethro Tull release their album Too Old to Rock ‘n’ Roll: Too Young to Die!.
April 25 – Portugal’s new constitution is enacted.
April 29 – Sino-Soviet split: A concealed bomb explodes at the gates of the Soviet embassy in China, killing four Chinese. The targets were embassy employees, returning from lunch, but on that day they returned to the embassy earlier.