Cloud Nine, cloud 9 or cloud nine is a name colloquially given to the state of euphoria, and may refer to:

• Cloud 9 (comics), a Marvel Comics superhero that debuted in Avengers: The Initiative
• Cloud Nine (novel), a 1984 crime novel by James M. Cain
• Cloud 9 (play), a 1979 play by Caryl Churchill

• CL 9 (Cloud 9), a remote control company
• Cloud9 (service provider), a mobile phone company in the Isle of Man
• Cloud9 IDE, an open source cloud web-based IDE
• CloudNine Communications, a web space / domain company
• Cloud Nine (Shanghai), a 2006 skyscraper and shopping mall in Shanghai
• Cloud Nine Movies, Indian film production and distribution company, based in Chennai
• Cloud9, an American esports organization

• "Cloud Nine" (Cow and Chicken), a 1999 television episode of Cow and Chicken
• Cloud 9 (2006 film), Burt Reynolds beach volleyball comedy motion picture
• Cloud 9 (2008 film), German film directed by Andreas Dresen
• Cloud 9 (2014 film), Disney Channel Original Movie
• The Ninth Cloud, 2014 independent film directed by Jane Spencer
• Cloud 9 (Superstore), the setting for the TV series Superstore

• Cloud Nine (Kygo album), 2016
• Cloud Nine (The Temptations album), 1969
• Cloud 9, a 2013 album by Eric Nam
• Cloud 9 (Nine album), 1996
• Cloud Nine (George Harrison album), 1987, or the title track
• Cloud Nine (Kottonmouth Kings album), 2007
• Cloud 9 The EP, a 2008 EP by Tinchy Stryder

• "Cloud 9" (Baker Boy song), 2017
• "Cloud 9" (Beach Bunny song), 2020
• "Cloud 9" (Jamiroquai song), 2017
• "Cloud 9" (Ms. Dynamite and Shy FX song), 2013
• "Cloud Nine" (The Temptations song), 1968
• "Cloud Number Nine", a song by Bryan Adams on his 1998 album On a Day Like Today
• "Cloud 9", a song by Sad Lovers & Giants from their 1982 album Epic Garden Music
• "Cloud 9", a song and 2007 mixtape by B.o.B.
• "Cloud Nine", a song by Owl City from their 2018 album Cinematic
• "Cloud Nine", a song by Evanescence from their 2006 album The Open Door
• "Cloud 9", a song by Puddle of Mudd from their 2003 album Life on Display
• "Cloud 9", a song by Toploader from their 1999 album Magic Hotel
• "Cloud 9", a song by Maaya Sakamoto on Wolf's Rain Original Soundtrack, Volume 2
• "Cloud 9", a song by Robin Thicke from his 2011 album Love After War
• "Cloud 9", a song by Chamillionaire from his 2013 album Reignfall
• "Cloud Nine", a song by Leigh Nash on her 2006 album Blue on Blue
• "Cloud Nine", a song by Onetwo on their 2007 album Instead
• "Cloud Nine", a 2001 song by Kim Lukas
• "Cloud 9", a song from the 2014 film Cloud 9, on the album Disney Channel Play It Loud
• "Cloud 9", a song by Emarosa from their 2016 album 131
• "Cloud Nine", a song by Ben Howard from his 2009 EP These Waters
• "Cloud 9", a song by the boyband Exo from their 2016 album Ex'Act
• "Cloud Nine", a 2018 song by Mind Against from their album Days Gone
• "Cloud 9", a song by Volbeat from their 2019 album Rewind, Replay, Rebound
• "Cloud 9", a song by Reks from his 2009 album More Grey Hairs
• "Cloud 9", a 2014 single by Itro & Tobu for NoCopyrightSounds
• "Cloud Nine", a song by Machine Girl for the 2022 video-game Neon White

• Cloud 9, the surf break in Siargao, the Philippines
• Cloud 9, business class on Ethiopian Airlines
• Cloud Nine (sphere), giant sky-floating tensegrity spheres named by Buckminster Fuller
• Cloud 9, Filipino candy bar produced by Universal Robina

• Cloud 7, a 1955 album by Tony Bennett