Timothy James "Tim" McVeigh (April 23, 1968 – June 11, 2001) was an American domestic terrorist who detonated a truck bomb in front of the Alfred P. Murrah Federal Building in Oklahoma City on April 19, 1995. Commonly referred to as the Oklahoma City Bombing, the attack killed 168 people and injured over 800. It was the deadliest act of terrorism within the United States prior to the September 11, 2001 terrorist attacks.

McVeigh, a militia movement sympathizer, sought revenge against the federal government for its handling of the Waco Siege, which had ended in the deaths of 76 people exactly two years prior to the bombing, as well as for the Ruby Ridge incident in 1992. McVeigh hoped to inspire a revolt against what he considered to be a tyrannical federal government. He was convicted of 11 federal offenses and sentenced to death. His execution took place on June 11, 2001 at the Federal Correctional Complex in Terre Haute, Indiana. Terry Nichols and Michael Fortier were also convicted as conspirators in the plot.

In addition to McVeigh, Terry Nichols was convicted and sentenced in federal court to life in prison for his role in the crime. At Nichols' trial, evidence was presented indicating that others may have been involved. Several residents of central Kansas, including real estate agent Georgia Rucker and a retired Army NCO, testified at Terry Nichols' federal trial that they had seen two trucks at Geary Lake State Park, where prosecutors alleged the bomb was assembled. The retired NCO said he visited the lake on April 18, 1995, but left after a group of surly men looked at him aggressively. The operator of the Dreamland Motel testified that two Ryder trucks had been parked outside her Grandview Plaza motel where McVeigh stayed in Room 26 the weekend before the bombing. Terry Nichols is currently incarcerated at the Federal Supermax Prison in Florence, Colorado.

An ATF informant, Carolyn Howe, told reporters that shortly before the bombing she had warned her handlers that guests of Elohim City, Oklahoma were planning a major bombing attack. McVeigh was issued a speeding ticket there at the same time. Other than this speeding ticket, there is no evidence of a connection between McVeigh and members of the Midwest Bank Robbers at Elohim City.

In February 2004, the FBI announced it would review its investigation after learning that agents in the investigation of the Midwest Bank Robbers (an alleged Aryan-oriented gang) had turned up explosive caps of the same type that were used to trigger the Oklahoma City bomb. Agents expressed surprise that bombing investigators had not been provided information from the Midwest Bank Robbers investigation.

McVeigh declined further delays and maintained until his death that he had acted alone in the bombing.