Presenting statistics on crime in the United States for 2001, this annual Federal Bureau of Investigation (FBI) report presents data reported to the FBI’s Uniform Crime Reporting (UCR) Program. After explaining that the UCR Program, begun in 1929, was designed to capture criminal offenses including murder, non-negligent manslaughter, forcible rape, robbery, aggravated assault, burglary, larceny-theft, and motor vehicle theft reported to local and State law enforcement agencies, the Forward to this work indicates that the FBI recognizes that the UCR Program needs to be improved to better describe modern crimes such as domestic and international terrorism brought to light by the events of September 11, 2001. After summarizing the UCR Program’s background, advisory groups, and frequent redesigns and developments, this report presents the 2001 crime index total, month by month, for various regions of the United States. Addressing various crime committed in 2001, this report presents regional crime rate statistics in an extensive series of tables, charts, and graphs for the various types of crime offenses listed above and for arson and hate crimes, presenting crime indices for each State. The next major section of this report presents the crime index of offenses cleared by arrest or exceptional means such as identifying the offender. Comprehensive tables presenting statistics on numbers and rates of arrests made in 2001 by race, by gender, age, and region and a special report compiling data on the numbers of victims of September 11, 2001’s terrorist attack comprise the next two sections of this report. Numerous statistical charts presenting numbers of full-time law enforcement employees are followed by a series of appendices describing the methods used in the UCR program, descriptions of offenses detailed in the UCR program, definitions used throughout this report, other measurements of crime in the United States, State and national crime reporting directories, and a UCR publications list.