"Army" is a song by English singer and songwriter Ellie Goulding from her third studio album, Delirium (2015). The song was released on 9 January 2016 as the album's second single.

"Army" is written in the key of B major with a tempo of 87 beats per minute. Goulding's vocals span from B₃ to B₄. The song was written about Goulding's best and closest friend, Hannah.

The music video for "Army" was directed by Conor McDonnell and premiered on 14 January 2016. Shot in black and white, the video features Goulding having fun with friends in several settings, as well as performing the song live.

Credits adapted from the liner notes of Delirium.

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