"Cloud Number Nine" (sometimes spelled as "Cloud #9" or "Cloud Number 9") is a song by Canadian singer-songwriter Bryan Adams. It was released in April 1999 as the third single from his 1998 album On a Day Like Today. Its single version is notable for being one of the few remixes Bryan Adams released and the only one to gain notable chart success since his debut single, which received a remix treatment in 1979.

The song was first released on Adams' 1998 album "On a Day Like Today", and is the only place it appears in its original form. It is produced by noted rock producer Bob Rock, and mixed by Adams' longtime collaborator Bob Clearmountain.

A demo version of the song appears on the CD single "The Best Of Me", released in November 1999, following the chart run of the Chicane Mix. It features a prominent beat throughout the recording, provided by co-writer Max Martin. He used a similar beat on his early productions for Britney Spears. Also, the released demo version had a longer first verse than the one ending up on the album and all other subsequent versions. According to co-writer Gretchen Peters, who wrote most of the song's lyrics, it was Adams' decision to scrap the lines.

It was remixed by British electronic artist Chicane, with synthesizers added, as well as a drum sample from Gota Yashiki's "Groove Activator". It was released as a single in May 1999 in Europe. The single reached number 6 in the UK Singles Chart, and became a top 10 hit in Ibiza. Chicane said upon its release in 1999, he'd turned down a previous offer of remixing a Bryan Adams single, due to a lack of time. Chicane later worked with Adams of the songs "Don't Give Up", "East Side Story", and "She's Got A Way".

Chicane's mix of the song was featured on Bryan Adams' compilation album The Best of Me, however simply titled "Cloud Number Nine". It appeared again on his 2005 Anthology album, this time titled correctly as "Cloud Number Nine (Chicane Mix)". The Chicane Mix has become the standard live version for Bryan. In 2000, Chicane joined Bryan onstage to perform this song and "Don't Give It Up", as can be seen on Bryan's DVD Live At Slane Castle.

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