Islamic Jihad Organization and later dies in captivity.
 Gary Plauche fatally shoots his son Jody's sexual abuser, Jeff Doucet, at Baton Rouge Metropolitan Airport in Louisiana.
 March 22 – Teachers at the McMartin Preschool in Manhattan Beach, California are charged with Satanic ritual abuse of the school children; the charges are later dropped as completely unfounded.
 March 23 – General Rahimuddin Khan becomes the first man in Pakistan's history to rule over two of its provinces, after becoming interim Governor of Sindh.
 March 25
 Pope John Paul II consecrates the world to the Immaculate Heart of Mary, in Fátima, Portugal.
 The Institute of the Incarnate Word (IVE) is founded under Fr. Carlos Miguel Buela.

April
 April 1 – Death of Marvin Gaye: Marvin Gaye is shot to death bya space walk.
 July 27 – Metallica releases their second studio album Ride the Lightning.
 July 28–August 12 – The 1984 Summer Olympics are held in Los Angeles, California.

August
 August 1 – Australian banks are deregulated.
 August 4
 The African republic Upper Volta changes its name to Burkina Faso.
  reaches a record submergence depth of 1,020 meters.
 August 11
 United States President Ronald Reagan, during a voice check for a radio broadcast remarks, "My fellow Americans, I'm pleased to tell you today that I've signed legislation that will outlaw Russia forever. We begin bombing in five minutes".
 Barefoot South African runner Zola Budd, controversially granted British citizenship earlier in the year, and Mary Decker of the U.S. collide in the Olympic 3,000 meters final, neither finishing as