"Friend or Foe" is a song by Russian recording duo t.A.T.u., taken from the group's second English language studio album Dangerous and Moving (2005). The song was written by Dave Stewart and Martin Kierszenbaum, while production was handled by Kierszenbaum and Robert Orton. The song was released by Interscope on 2 October 2005 as the album's second single. Musically, the song is a pop rock and electropop inspired song, with dance music influences. The song features ambiguous lyrics; it is unclear who exactly the words are directed at.

The song received generally positive reviews from critics, with many identifying it as the album's best song along with its praised for its dance nature and lyrical content. The song did not perform successfully like the group's previous single "All About Us", chart just under the top forty in most countries it charted in. An accompanying music video was issued, where it featured the group singing in a cave to fans.

The song was written by Dave Stewart and Martin Kierszenbaum, while production was handled by Kierszenbaum and Robert Orton. The song was released by Interscope on 2 October 2005 as the album's second single. For the production and promotion of the single, it was handled by some big names from the rock music industry. These included Sting, who played bass on the track and Bryan Adams, who shot the striking cover sleeve. The song was the group's last single to be released in the United Kingdom and United States, due to the lack of success.

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