For the official fan club in the UK, please see Star Trek: The Official Fan Club of the UK.

The Official Star Trek Fan Club was the official and authorized fan club for the Star Trek franchise. At its largest, the group had more than 100,000 subscribers.

The fan club started as an unofficial fanzine published by Dan Madsen beginning in 1979. By 1982, Paramount Pictures authorized the magazine and it became the Star Trek: The Official Fan Club Magazine. In 1986, Madsen founded FANtastic Media to run both the club and magazine. In 1995, the magazine became the Star Trek: Communicator.

A number of limited edition starship replicas including the Captain's yacht "Cousteau" and the Vulcan ship from Star Trek: First Contact were released by John Eaves and the fan club, in conjunction with the magazines. Along with a Deep Space 9 replica, they have become much sought-after collectors' items.

On 9 February 2001, Decipher purchased the assets of FANtastic Media, including the Fan Club, and continued publication of Communicator until 2005, when the company announced the cancellation of the magazine after Star Trek: Communicator issue 155.

Paramount and CBS announced a new fan club in 2008, but nothing came of it.