Updated: August 16, 2023

Star Trek is an American science fiction media franchise based on the television series created by Gene Roddenberry. The first television series, simply called Star Trek and now referred to as The Original Series, debuted in 1966 and aired for three seasons on the television network NBC. It followed the interstellar adventures of Captain James T. Kirk (William Shatner) and his crew aboard the starship USS Enterprise, a space exploration vessel, built by the interstellar federal republic United Federation of Planets in the twenty-third century. The Star Trek canon of the franchise includes The Original Series, an animated series, four spin-off television series, its film franchise and an upcoming television series scheduled to debut in 2017.

Star Trek has been a cult phenomenon for decades. Fans of the franchise are called Trekkies or Trekkers. The franchise spans a wide range of spin-offs including games, figurines, novels, toys, and comics. Star Trek had a themed attraction in Las Vegas that opened in 1998 and closed in September 2008. At least two museum exhibits of props travel the world. The series has its own full-fledged constructed language, Klingon. Several parodies have been made of Star Trek. In addition, viewers have produced several fan productions. As of July 2016, the franchise had generated $10 billion in revenue, making Star Trek one of the highest-grossing media franchises of all time.

Star Trek is noted for its cultural influence beyond works of science fiction. The franchise is also noted for its progressive civil rights stances. The Original Series included one of television's first multiracial casts. Star Trek references can be found throughout popular culture from movies such as the submarine thriller Crimson Tide to the animated series South Park.