Journey Into Space is a BBC Radio science fiction programme written by BBC producer Charles Chilton. It was the last UK radio programme to attract a bigger evening audience than television. Originally, four series were produced (the fourth was a remake of the first), which was translated into 17 languages (including Hindi, Turkish and Dutch) and broadcast in countries worldwide (including Australia, the Netherlands, New Zealand and The United States). Chilton later wrote three best-selling novels and several comic strip stories based upon the radio series.

The first series was created in 1953, soon after Riders of the Range (a popular Western, also written by Chilton) ended its six series on the BBC Light Programme. Michael Standing, then Head of the BBC Variety Department, asked Chilton if he could write a sci-fi programme, and Journey to the Moon (later known as Operation Luna) was the result. Each half-hour episode would usually end with a dramatic cliffhanger, to increase the audience's incentive to tune into the next episode.

The original magnetic recordings of the show were erased shortly after broadcast, and for several decades it was believed that no recordings of the show had survived, although some were broadcast by the American Forces Radio and Television Service (AFRTS, formerly AFN) in Europe during the late 1970s. In 1986, a set of misfiled Transcription Service discs (produced for sale to overseas radio stations) was discovered, containing complete copies of the three original series (more accurately, the surviving version of the first series is a cut-down remake of the original, produced for the Transcription Service during the 1950s). This discovery enabled the BBC to begin re-broadcasting the show in the late 1980s, and release copies of the show, first on audio cassette, and more recently on CD and internet download.

Fans of Journey Into Space included Colin Pillinger, Kenny Everett, John Major, Stephen Hawking, Miriam Margolyes, and former Doctor Who producer Philip Hinchcliffe.

The four main characters appear in all the original series, as well as the later special episodes:

Guy Kingsley Poynter (who played Doc) had worked with Charles Chilton before Journey Into Space, and Chilton once commented that Poynter "was a very good poetry reader". Chilton also observed that Bruce Beeby was like his character Mitch, and was "always blowing his top".

David Kossoff asked Chilton if his character (the ship's radio operator) could be called Lemuel (a name he loved), and Chilton shortened the name to Lemmy. Chilton based Lemmy's character on himself, since he had been a radio operator in the RAF. Originally, Chilton had chosen John Glen to play Jet, but later decided to use Andrew Faulds instead, because Chilton's secretary fancied him.

David Jacobs's ability to play a wide variety of characters, each with their own distinctive voice, resulted in him playing 22 different characters during the course of Journey Into Space. He used to mark up his script using different colour pencils, to help him remember what each character was supposed to sound like. In episode 1 of The Red Planet, Jet is interviewed by a group of newspaper reporters, all of whom were played by Jacobs.