The Operative: No One Lives Forever (abbreviated as NOLF) is a first-person shooter video game developed by Monolith Productions and published by Fox Interactive, released for Windows in 2000. The game was ported later to the PlayStation 2 and Mac OS X in 2002.

A story-driven game set in the 1960s, No One Lives Forever received critical acclaim for its stylistic representation of the era in the spirit of many spy films and television series of that decade, as well as for its humor. Players control female protagonist Cate Archer, who works for a secret organization that watches over world peace. In addition to a range of firearms, the game contains several gadgets disguised as ordinary female fashion items.

At the time of its release, many reviewers felt that No One Lives Forever was one of the best first-person shooters since 1998's Half-Life. After receiving several Game of the Year awards in the press, a special Game of the Year Edition was released in 2001, which included an additional mission on a remote island in the South Pacific. The Operative: No One Lives Forever was followed by a sequel, No One Lives Forever 2: A Spy in H.A.R.M.'s Way, in 2002, and a spin-off titled Contract J.A.C.K. released in 2003, both developed by Monolith.

A re-release of the game has been hampered by the complicated state of the series' intellectual property (IP) rights, with even parties assumed to be in possession of the IP having publicly admitted not knowing the precise legal situation of the series.