Magnum, P.I. is an American crime drama television series starring Tom Selleck as Thomas Magnum, a private investigator (P.I.) living on Oahu, Hawaii. The series ran from 1980 to 1988 during its first-run broadcast on the American television network CBS. Magnum, P.I. consistently ranked in the top twenty U.S. television programs in the Nielsen ratings during the first five years of its original run in the United States, finishing as high as number three, that for the 1982–83 season.
A reboot series of the same name was ordered to series on May 11, 2018, and premiered on September 24, 2018 on CBS.