FX (originally/formerly Fox Extended) is an American pay television channel owned by FX Networks, a division of the Disney Entertainment business segment of the Walt Disney Company. Based at the Fox Studios lot in Century City, Los Angeles, FX was originally launched by the first-incarnation News Corporation on June 1, 1994, and later became one of the properties that was included in Disney's acquisition of one of News Corporation's successor companies, 21st Century Fox, in 2019. The channel's original programming aspires to the standards of premium cable channels in regard to mature themes and content, high-quality writing, directing and acting. Sister channels FXM and FXX were launched in 1994 and 2013, respectively. FX also carries reruns of theatrical films and terrestrial-network sitcoms. Advertising-free content was available through the FX+ premium subscription service until it was shut down on August 21, 2019, after which ad free content moved to Hulu with no ads.

As of November 2023^[update], FX is available to approximately 71 million pay television households in the United States - down from its 2011 peak of 99 million households. In addition to the flagship U.S. network, the "FX" name is licensed to a number of related pay television channels in various countries around the world.

FX, originally stylized as "fX", launched on June 1, 1994. Broadcasting from a large "apartment" in Manhattan's Flatiron District, fX was one of the first forays into large-scale interactive television. The channel centered on original programming, which was broadcast live every day from the "fX Apartment", and rebroadcasts of classic television shows from the 1960s, 1970s and 1980s, such as The Fall Guy, Batman, Wonder Woman, Eight Is Enough, Nanny and the Professor, and The Green Hornet. fX had two taglines during this period: "TV Made Fresh Daily" and "The World's First Living Television Network". The "f" in the channel's name and logo was rendered in lower-case to portray a type of relaxed friendliness; the stylized "X" represented the channel's roots: the crossing searchlights of the 20th Century Fox logo.

The live shows were each mostly focused on one broad topic. Shows included Personal fX (collectibles and antiques), The Pet Department (pets), Under Scrutiny with Jane Wallace (news) and Sound fX (music). The channel's flagship show, Breakfast Time, hosted by Laurie Hibberd and Tom Bergeron and inspired by the British morning show The Big Breakfast, was formatted like an informal magazine show. Breakfast Time and Personal fX would regularly feature the channel's "roving reporters" – which included Suzanne Whang, John Burke and Phil Keoghan – visiting unique places around the United States live via satellite. Other notable fX personalities included Karyn Bryant and Orlando Jones, who were panelists on Sound fX.

The channel prided itself on its interactivity with viewers. fX, in 1994, was an early adopter of the internet, embracing e-mail and the World Wide Web as methods of feedback. Most of the shows would feature instant responses to e-mailed questions, and one show, Backchat (hosted by Jeff Probst), was exclusively devoted to responding to viewer mail, whether sent through e-mail or traditional postal mail. Select viewers were allowed to spend a day at the "apartment" and take part in all of the channel's shows. Inside the channel's syndicated programming blocks, channel hosts would frequently appear during commercial breaks to read news headlines, respond to e-mails from viewers about the episode that was airing, or to promote upcoming programming.

In 1995, Liberty Media purchased a 50% stake in the network as part of their alliance with News Corporation to form Fox Sports Net; as a part of this plan, fX became the national home for Fox Sports programming over the next few years.

The first incarnation of fX was not available on Time Warner Cable, one of the major cable systems in New York City, where its programming originated. TWC would not carry the channel until September 2001.

The live shows gradually disappeared one by one until only Personal fX remained. Breakfast Time was moved to the Fox network and renamed Fox After Breakfast in mid-1996. It underwent several format changes, but never found a substantial audience and was canceled less than a year later. By the time that all live programming (with the exception of Personal fX) was dropped, the channel focused entirely on its classic television shows until its relaunch in mid-1997. Personal fX remained on the refocused FX until May 1, 1998. FX vacated the "apartment" in the summer of 1998 and the channel's operations were streamlined with the other Fox-owned subscription channels.