A rainbow is a meteorological phenomenon that appears as a multicolored arc when sunlight is reflected by drops of water.

Rainbow may also refer to:

• The Rainbow (painting), a 1878 oil painting by American artist George Inness
• Rainbow (sculpture), a 1970 sculpture at the Lynden Sculpture Garden

• The Rainbow (1929 film), an American film
• Rainbow (1944 film), a Soviet war film
• Rainbow (1978 film), an American made-for-television biographical film about Judy Garland
• The Rainbow (1989 film), a 1989 British drama, adapted from the Lawrence novel
• Rainbow (1996 film), a British-Canadian family adventure
• Rainbow (2005 film), a Chinese drama
• Rainbow (2008 film), an Indian film
• The Rainbow (2016 film), a 2016 Sri Lankan Sinhala masala film directed by Nalin Rajapakshe
• The Rainbow (BBC miniseries), a 1988 BBC miniseries based on the D. H Lawrence novel
• Rainbow (musical), a 1928 Broadway musical
• Rainbow (TV series), a 1972–1997 British children's programme
• Rainbow: Nisha Rokubō no Shichinin, a 2003 manga and anime series

• Rainbow (Noon Universe), a planet
• Rainbow, an organization in Tom Clancy's Rainbow Six novel series
• Rainbow Johnson, a character in the American sitcom Black-ish and Mixed-ish
• Rainbow Puppy, a character in the Nick Jr. TV series Blue's Clues & You!

• "The Rainbow", also known as "My Heart Leaps Up", an 1807 poem by William Wordsworth
• The Rainbow, a novel by D. H. Lawrence

• Rainbow (Boris and Michio Kurihara album), 2006
• Rainbow (Mariah Carey album), 1999
• Rainbow (Johnny Cash album), 1985
• Rainbow (Miho Fukuhara album), 2009
• Rainbow (Ayumi Hamasaki album), 2002
• Rainbow (Dolly Parton album), 1987
• Rainbow, a 1973 album by McGuinness Flint
• Rainbow (Neil Diamond album), 1973
• Rainbow (Kesha album), 2017
• Rainbow (John Handy album), 1981
• Rainbow (Sayaka Yamamoto album), 2016
• Rainbows (album), by Alexandra Stan, 2022

• Rainbow (rock band), a British rock group led by Ritchie Blackmore
• Rainbow (Thai band), a Thai pop band
• Rainbow (group), a South Korean girl group
• Rainbow Records, a record label
• L'Arc-en-Ciel (The Rainbow), a Japanese rock band

• "Rainbow" (Curtis Mayfield song), 1962
• "Rainbow" (Kacey Musgraves song), 2019
• "Rainbow" (Russ Hamilton song), 1957
• "Rainbow" (Sia song), 2017
• "Rainbows" (Alice Nine song), 2008
• "Rainbows" (Dennis Wilson song), 1977
• "Rainbow", a song by Blackfoot from After the Reign
• "Rainbow", a song by Colbie Caillat from her 2009 album Breakthrough
• "Rainbow", a song by Émilie Simon from The Big Machine
• "Rainbow", a song by Lynsey de Paul from the 1974 album Taste Me... Don't Waste Me
• "Rainbow" (The Marmalade song), a song by the band Marmalade
• "Rainbow", a song by Meghan Trainor from the 2022 album Takin' It Back
• "Rainbow", a song by Robert Plant from the 2014 album Lullaby and... The Ceaseless Roar
• "Rainbow", a song by Filipino band South Border from the 2004 album Episode III
• "Rainbow", a song by Jay Chou from the 2007 album On the Run!
• "Rainbows", a song by Madvillain from the 2004 album Madvillainy
• "The Rainbow", a song by Talk Talk from the 1988 album Spirit of Eden
• "The Rainbow Song", a children's song sung on the television series Barney & Friends
• "Rainbow Song", a song by America on the 1973 album Hat Trick
• "Rainbow, Rainbow", a song by Peppa Pig on the 2019 album My First Album
• "Alien Hits/Alien Radio", a song by Coldplay on the 2024 album Moon Music, which was stylised as "".

• Rainbow, a water filter vacuum cleaner by Rexair
• Rainbow Babies & Children's Hospital, a hospital in Ohio, United States
• Rainbow Bar and Grill, a bar and restaurant in West Hollywood, California, United States
• Rainbow Centre, Karachi, a building in Karachi, Pakistan
• Rainbow Foods, a Minnesota grocery store
• Rainbow Media Holdings, now AMC Networks, formerly a subsidiary of Cablevision
• Rainbow Room, an upscale restaurant and nightclub in Rockefeller Center, Midtown Manhattan, New York City
• Rainbow S.r.l., Italian animation studio
• Rainbow Sandals, a footwear brand
• Rainbow Shops, a fashion retail chain
• Rainbow Stores, a supermarket chain owned by Anglia Regional Co-operative Society
• Rainbow Ski Area, a ski resort in the Tasman Region of New Zealand's South Island
• Rainbow Studios, a video game developer
• Rainbow Theatre, a building in the Finsbury Park area of North London, UK

• Rainbow 100, a microcomputer
• Rainbow storage
• Rainbow table, a data structure used in password cracking
• Rainbow, an application using the Okapi Framework

• Rainbow flag (LGBT), a symbol of diversity in the lesbian, gay, bisexual and transgender communities
• Rainbow flags, flags used in various cultures and movements

• AGM-136 Tacit Rainbow, a missile program
• List of Rainbow Codes, a series of code names used for British military projects
• Operation Rainbow, a 2004 Israel military operation in Gaza Strip
• Rainbow, an L-class blimp given the US Navy designation L-7 in World War II
• Project RAINBOW, a CIA project
• Rainbow Sideboys, an honor guard used on aircraft carriers
• Rainbow Herbicides, a form of herbicidal warfare
• Rainbow Plans, a series of U.S. war plans
• Republic XF-12 Rainbow, a 1940s military reconnaissance aircraft
• Rainbow Division, another name for the 42nd Infantry Division of the United States Army National Guard

• RAINBO, an international non-governmental organization
• Rainbows (Girl Guides), a youth organization in the UK
• Rainbow (Greece), a Greek regionalist political party
• Rainbow (Iceland), an Icelander eurosceptic and socialist party
• Rainbow Family, a loosely affiliated group of individuals committed to principles of non-violence and egalitarianism
• Rainbow Motorcycle Club, a gay men's motorcycle club based in San Francisco, California
• Rainbow/PUSH Coalition, a US political organization

• Rainbow (musician), member of the Birthday Massacre
• Rainbow Rowell (born 1973), American author of YA and adult contemporary novels
• Rainbow George Weiss (1940–2021), British politician
• Jeramy "Rainbow" Gritter, member of Whitestarr
• Bernarr Rainbow (1914–1998), organist and choir master
• Randy Rainbow (born 1981), American comedian and singer
• William Joseph Rainbow (1856–1919), Australian entomologist
• Edward Rainbowe (1608–1684), Bishop of Carlisle
• Rainbow Sun Francks (born 1979), Canadian actor and songwriter

• Rainbow, Alabama
• Rainbow, California
• Rainbow, Placer County, California
• Rainbow, Ohio
• Rainbow, Oregon
• Rainbow, Texas

• Rainbow, Victoria, Australia
• Rainbow, Alberta, Canada

• Rainbow Range (Chilcotin Plateau), British Columbia, Canada
• Rainbow Range (Rocky Mountains), British Columbia and Alberta, Canada
• Rainbow Springs, Florida, United States

• Rainbow (1837 ship), an iron paddle-wheel steamer, Birkenhead, England
• Rainbow (clipper), the first extreme clipper ship to sail in the China trade (1845)
• Rainbow (sternwheeler), a steamboat which operated in Oregon, United States
• Rainbow (yacht), a J-class yacht involved in the America's Cup
• HMCS Rainbow, one of two Canadian warships
• HMS Rainbow, one of nine British warships
• MV Rainbow, a Greek ship
• USS Rainbow, a ship of the United States Navy

• Rainbow (Netherlands), a 1989 alliance of Dutch political parties
• Rainbow (ride), an amusement park ride
• Rainbow BRTS, a bus rapid transit system in Pune and Pimpri Chinchwad, Maharashtra, India
• The Rainbow (magazine), a 1981–1993 computer magazine

• All pages with titles beginning with Rainbow
• All pages with titles containing Rainbow
• Over the Rainbow (disambiguation)
• Rainbow Coalition (disambiguation)
• Rainbow Range (disambiguation)
• Rainbow Road (disambiguation)
• Rainbow skink (disambiguation)
• Rainbow Warrior (disambiguation)
• Rainbowman (disambiguation)
• Rainbows in culture
• Rainbows in mythology
• Runbow, a 2015 video game