List of mass shootings in the United States (2000–2009)

This page provides a list of mass shootings that occurred in the United States between January 1, 2000, and December 31, 2009. For the purposes of this list, a mass shooting is defined as an incident in which four or more people are shot and killed, excluding the shooter. This definition aligns with the standard used by the Congressional Research Service and often adopted in academic and journalistic reporting, although other definitions exist.

This list includes the date of the shooting, the location, a brief description of the event, and the number of fatalities. It aims to be as comprehensive as possible based on available public information, including news reports, government documents, and academic studies. Due to the varying definitions of "mass shooting" and the potential for underreporting, this list may not be exhaustive. The incidents listed are generally those that gained significant media attention and resulted in substantial loss of life.

The compilation of such data is challenging due to differing definitions and evolving criteria. The data presented here attempts to adhere to the definition stated above but may still be subject to interpretation. Researchers and readers are encouraged to consult multiple sources and exercise caution when interpreting the data.

It is important to note that this list focuses solely on mass shootings, meaning incidents involving firearms. Other forms of mass violence, such as bombings or stabbings, are not included. This also does not include incidents of gang violence, robberies, or domestic disputes where the primary motive was not indiscriminate killing. The inclusion of an event on this list does not imply any particular political stance or endorsement of any specific policy regarding gun control or public safety. The purpose is solely to provide a factual record of these tragic events.