"New Moon on Monday" is a song by Duran Duran, released as the band's tenth single in early January 1984 in the US and on 23 January 1984 in the UK.

The second single to be lifted from the band's 1983 album Seven and the Ragged Tiger, the song was another success, reaching the Top 10 on both the British and American music charts. On 11 February 1984, the single reached #9 on the UK Singles Chart and on 17 March, it reached #10 on the Billboard Hot 100, after entering on 14 January 1984 at #56.

It did not chart well in Australia and Scandinavia; territories where its predecessor, "Union of the Snake", had been a big hit. This trend was reversed with the next single, "The Reflex", which became a worldwide number one.

In a retrospective review of the song, "New Moon on Monday" was praised by Allmusic journalist Donald A. Guarisco, who wrote: "The music holds the unusual lyrics together by wedding effervescent verse melodies that bounce high and low to a triumphant-sounding chorus with a rousing feel."

The music video for "New Moon on Monday" was filmed by director Brian Grant during the icy first week of January 1984, in the village of Noyers in France. It has a loosely sketched storyline in which the band appear as members of an underground rebellion called "La Luna" (the name is one of the few connections between the video's content and the song lyrics), organizing a revolt against a modern (1980s-era computers are used) oppressive militaristic regime, apparently in France.

"We set out to make a little movie", recalled Grant. "I'm not sure we succeeded." He was not the first choice to shoot the video, as Russell Mulcahy, director of many of the band's other videos, was unavailable.

Several versions of this video exist. The longest is a 17-minute "movie version" which includes an extended introduction before the song starts (including a scene of dialogue between Simon Le Bon and the story's female lead, played by Patricia Barzyk, winner of the Miss France title in 1980; a brief snippet of "Union of the Snake" is also heard on a radio), and is set to an extended remix of the song. A shorter version, with a spoken French-dialogue intro, was originally submitted to MTV, who then later requested an even shorter version without the prologue.

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