The Oklahoma City bombing was a domestic terrorist truck bombing of the Alfred P. Murrah Federal Building in Oklahoma City, Oklahoma, United States, on April 19, 1995. Perpetrated by two anti-government extremists with white supremacist, right-wing terrorist sympathies, Timothy McVeigh and Terry Nichols, the bombing happened at 9:02 a.m. and killed at least 168 people, injured more than 680 others, and destroyed more than one-third of the building, which had to be demolished. The blast destroyed or damaged 324 other buildings within a 16-block radius, shattered glass in 258 nearby buildings, and destroyed or burned 86 cars, causing an estimated $652 million worth of damage. Local, state, federal, and worldwide agencies engaged in extensive rescue efforts in the wake of the bombing. The Federal Emergency Management Agency (FEMA) activated 11 of its Urban Search and Rescue Task Forces, consisting of 665 rescue workers who assisted in rescue and recovery operations. The Oklahoma City bombing remains the deadliest act of domestic terrorism in U.S. history.

Within 90 minutes of the explosion, McVeigh was stopped by Oklahoma Highway Patrolman Charlie Hanger for driving without a license plate and arrested for illegal weapons possession. Forensic evidence quickly linked McVeigh and Nichols to the attack; Nichols was arrested, and within days, both were charged. Michael and Lori Fortier were later identified as accomplices. McVeigh, a veteran of the Gulf War and a sympathizer with the U.S. militia movement, had detonated a Ryder rental truck full of explosives he parked in front of the building. Nichols had assisted with the bomb's preparation. Motivated by his dislike for the U.S. federal government and unhappy about its handling of the Ruby Ridge incident in 1992 and the Waco siege in 1993, McVeigh timed his attack to coincide with the second anniversary of the fire that ended the siege at the Branch Davidian compound in Waco, Texas.The official FBI investigation, known as "OKBOMB", involved 28,000 interviews, 3.5 short tons (3,200 kg) of evidence and nearly one billion pieces of information. When the FBI raided McVeigh's home, it found a single telephone number in the phone book. The FBI traced the number to a home where there was a family. The FBI interviewed the homeowner and found that the homeowner shared a phone number with a farm a few hours away where McVeigh bought the supplies for the bombing. The bombers were tried and convicted in 1997. Sentenced to death, McVeigh was executed by lethal injection on June 11, 2001, at the U.S. federal penitentiary in Terre Haute, Indiana. Nichols was sentenced to life in prison in 2004. Michael and Lori Fortier testified against McVeigh and Nichols; Michael Fortier was sentenced to 12 years in prison for failing to warn the United States government, and Lori received immunity from prosecution in exchange for her testimony.

In response to the bombing, the U.S. Congress passed the Antiterrorism and Effective Death Penalty Act of 1996, which tightened the standards for habeas corpus in the United States. It also passed legislation to increase the protection around federal buildings to deter future terrorist attacks.

On April 19, 2000, the Oklahoma City National Memorial was dedicated on the site of the Murrah Federal Building, commemorating the victims of the bombing. Remembrance services are held every year on April 19, at the time of the explosion.

Timothy James McVeigh (April 23, 1968 – June 11, 2001) was an American domestic terrorist responsible for the 1995 Oklahoma City bombing that killed 168 people, 19 of whom were children, and injured more than 680 others, and destroyed one third of the Alfred P. Murrah Federal Building. The bombing was the deadliest act of terrorism in the United States prior to the September 11 attacks. It remains one of the deadliest acts of domestic terrorism in U.S. history.

A Gulf War veteran, McVeigh sought revenge against the federal government for the 1993 Waco siege that ended in the deaths of 82 people, many of whom were children, as well as the 1992 Ruby Ridge incident and American foreign policy. He hoped to inspire a revolution against the federal government, and defended the bombing as a legitimate tactic against what he saw as a tyrannical government. He was arrested shortly after the bombing and indicted on 160 state offenses and 11 federal offenses, including the use of a weapon of mass destruction. He was found guilty on all counts in 1997 and sentenced to death.McVeigh was executed by lethal injection on June 11, 2001, at the Federal Correctional Complex in Terre Haute, Indiana. His execution, which took place just over six years after the offense, was carried out in a considerably shorter time than most inmates awaiting the death penalty.