"Subways of Your Mind" is a single by German new wave band Fex, recorded in 1984. In 1985, a demo cassette tape containing the song was released to promote the band's live tour across Northern and Central Germany, with the tape itself being primarily sold at the tour. On 18 March 2007, a cassette tape recording from a radio broadcast in the mid-1980s was uploaded online and garnered significant attention. The song remained unidentified, even after being uploaded to the Internet, prompting a 17-year-long search to identify the artist and song title. During this search, the song earned the nickname "The Most Mysterious Song on the Internet".

The song was recorded privately in Wilhelmshaven from a radio broadcast during the mid-1980s, possibly around 1984. In 2019, it became the subject of a viral Internet phenomenon, with many users of sites such as Reddit and Discord collaborating to identify the song and recording artist.

On 4 November 2024, the song was identified by Reddit user u/marijn1412 as "Subways of Your Mind" by Fex, a rock band from Kiel. Confirmation came with the release of a 1985 EP featuring a studio version of the song, as well as a recording of a live performance in the same year. On 12 January 2025, the daughter of the band's keyboardist Michael Hädrich posted to the Reddit community formed around the song that her father had found a cassette copy of the NDR version that had been played on German radio around 1984. The copy was released as a digital single the following day. However, the ¼ master tape containing this version has yet to be found. On 4 November, a higher-quality version of the NDR broadcast version of the track was found on tape in lead singer Ture Rückwardt's archives and uploaded to Bandcamp, containing an extended fadeout.

"Subways of Your Mind" is one of the most famous examples of lostwave, music of unknown origin.

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