This document provides a timeline of school shootings in the United States and other countries from 1764 to 2011. It begins with some of the earliest and deadliest school shootings, such as the 1999 Columbine High School shooting, and continues chronologically with over 50 additional shootings, providing basic details about each incident such as location, date, shooter, and number of casualties. The timeline shows that school shootings have been an ongoing problem in various parts of the world for many decades.