Kevin David Mitnick (August 6, 1963 - July 16, 2023) was an American computer security consultant, author, and convicted hacker. He is best known for his high-profile 1995 arrest and five years in prison for various computer and communications-related crimes. Mitnick's pursuit, arrest, trial, and sentence along with the associated journalism, books, and films were all controversial. After his release from prison, he ran his own security firm, Mitnick Security Consulting, LLC, and was also involved with other computer security businesses.

Computer hacking Mitnick gained unauthorized access to a computer network in 1979, at 16, when a friend gave him the telephone number for the Ark, the computer system that Digital Equipment Corporation (DEC) used for developing its RSTS/E operating system software. He broke into DEC's computer network and copied the company's software, a crime for which he was charged and convicted in 1988. He was sentenced to 12 months in prison followed by three years of supervised release. Near the end of his supervised release, Mitnick hacked into Pacific Bell voicemail computers. After a warrant was issued for his arrest, Mitnick fled, becoming a fugitive for two-and-a-half years.

According to the United States Department of Justice, Mitnick gained unauthorized access to dozens of computer networks while he was a fugitive. He used cloned cellular phones to hide his location and, among other things, copied valuable proprietary software from some of the country's largest cellular telephone and computer companies. Mitnick also intercepted and stole computer passwords, altered computer networks, and broke into and read private emails.