Stephen Craig Paddock (April 9, 1953 – October 1, 2017) was an American mass murderer who perpetrated the 2017 Las Vegas shooting. Paddock opened fire into a crowd of about 22,000 concertgoers attending a country music festival on the Las Vegas Strip, killing 60 people and injuring approximately 867 (at least 413 of whom were wounded by gunfire). Paddock killed himself in his hotel room following the shooting. The incident is the deadliest mass shooting by a lone shooter in United States history. Paddock's motive remains officially undetermined, and the possible factors are the subject of speculation.

Paddock was a real-estate investor, property manager, accountant, private pilot and video poker gambler who lived in Mesquite, Nevada.