• Millennialism, describing the 1000-year reign of Christ
• Millenarianism, the belief by a group in a coming major transformation of society after which all things will be changed
• Tertio millennio adveniente, an apostolic letter in preparation for the Roman Catholic Church's Great Jubilee

• Edel Millennium, a South Korean paraglider design
• Millennium (ship), a cruise ship
• Millennium train, an electric train run by Sydney Trains in Sydney

• Millennium bug, aka Y2K or Year 2000 problem, a data storage problem from the practice of abbreviating a four-digit year to two digits
• Windows ME, Windows Millennium Edition, an operating system
• Millennium, an integrated library system software package published by Innovative Interfaces, Inc.

Comics edit

• Millennium (comics), a series produced by DC Comics
• Millennium Publications, a defunct comic book publisher
• Millennium, Vampire Nazi regiment in the Hellsing manga series
• Millennium Items, magical relics in the manga series Yu-Gi-Oh!

Fiction edit

• The Millennium, a 1924 novel by Upton Sinclair
• Millennium, a 1976 novel in the Chet Kinsman series by Ben Bova
• Millennium (novel), a 1983 science fiction novel by John Varley
• Millennium, a 1995 novel by Jack Anderson
• Millennium (novel series), circa 2005, a series of novels spawning from a trilogy created by Stieg Larsson, also made into films, and continued by others

Non-fiction edit

• Millennium: A History of Our Last Thousand Years, a 1995 book by Felipe Fernández-Armesto
• Millennium (Holland book), a 2008 book by historian Tom Holland
• Millennium: Journal of International Studies, an academic periodical published from 1971–present

• Millennium (film), 1989 film based on the short story "Air Raid" by John Varley
• Millennium (TV series), 1996 television series by The X-Files creator Chris Carter
• Millennium (miniseries), 2010 Swedish miniseries based on the film adaptations of Stieg Larsson's Millennium series
• "The Millennium" (Seinfeld), 1997 episode from the eighth season
• "Millennium" (The X-Files), 1999 episode from the seventh season
• CNN Millennium, 1999 television series on human history from the 11th to the 20th centuries.
• Millennium: Tribal Wisdom and the Modern World, 1992 documentary series by anthropologist David Maybury-Lewis
• Millennium Entertainment, American independent film distributor
• Millennium Falcon, fictional starship from the Star Wars films

• Millennium Records, a record label

Bands edit

• The Millennium (band), a 1960s band led by Curt Boettcher
• Millennium (Indian band), a heavy metal band from Bangalore, India
• Millenium (Polish band), a progressive rock band from Poland

Albums edit

• Millennium (Backstreet Boys album), 1999
• Millennium (Earth, Wind & Fire album), 1993
• Millennium (Front Line Assembly album), 1994
• Millennium (Monstrosity album), 1996

Songs edit

• "Millennium" (Front Line Assembly song), a 1994 industrial metal song
• "Millennium" (song), a 1998 song by Robbie Williams
• "Millennium", 1994 song by Killing Joke from the album Pandemonium

• Millennium 2.2, a 1989 resource management game for Atari ST, Amiga and the PC
• Millennia: Altered Destinies, a PC game created by Take 2 Interactive in 1995
• Millennium (video game series), a Japanese series launched in 2009
• Millennia, a 2024 PC 4X turn-based strategy game

• Millennium BCP, a private bank in Portugal
• Millennium Chemicals, a subsidiary of Lyondell Chemical Company
• Millennium Interactive, a former games company, maker of James Pond and other games
• Millennium Development Goals, a compact among nations to end human poverty
• Millennium Kids, an international youth empowerment environmental organization
• Millennium Management, LLC, a hedge fund and a multistrategy investment management firm
• Millennium Media, an American film studio
• Millennium Pictures, an Australian production company
• Millennium (publisher), an imprint of UK publisher Orion Books
• White House Millennium Council (United States)
• Millennium Pharmaceuticals, a biopharmaceutical company in Cambridge, MA
• Millennium & Copthorne Hotels, a global hospitality company
• Tokio Millennium Re Ltd., a reinsurance company
• Millennium Group, a fictional centuries old secret society and criminal investigative consulting firm in the Millennium television series
• Millennium Science Initiative, an international project to build scientific research capability in Brazil, Chile, and Uruguay

• Millenium Camera, a landmark in Tumamoc Hill, Tucson, Arizona
• Millennium Complex, a building in Plymouth, England
• Millennium Park, Chicago park and entertainment venue
• Millennium High School (disambiguation), several US high schools
• Millennium (planet) or Tau Boötis Ab, an extrasolar planet in the Tau Boötis system
• Millennium Force, a roller coaster at Cedar Point in Sandusky, Ohio
• Millennium Stadium in Cardiff, Wales, UK
• Millennium Tower (disambiguation)
• Millennium Transmitter, broadcast transmitter tower of ABS-CBN Corporation in the Philippines

• Millennium celebrations, a worldwide series of events celebrating New Year's Eve 1999–2000
• Millennium Summit, a meeting among several leaders from September 6–8, 2000
• Operation Millennium, a very large air raid in the Bombing of Cologne in World War II
• Millennium Magic, a UK Rugby League event
• Millennium '73, a religious festival held by the Divine Light Mission at Astrodome featuring Guru Maharaj Ji
• Walt Disney World Millennium Celebration a celebration at Walt Disney World for the year 2000
• 2000 millennium attack plots, a series of Islamist terror plots planned around New Year's Eve 1999–2000

• Millennium Prize Problems, seven problems in mathematics stated by the Clay Mathematics Institute
• Millennium Technology Prize, a technology prize awarded by Technology Academy Finland

• Millennium stamp, a postage stamp issued to celebrate the beginning of the 3rd millennium, or to commemorate a millennium associated with a country's history
• New Millennium Program, a NASA program to test new technologies
• Millennium, an unusually strong beer made by Boston Beer Company
• Millennium Run, also known as Millennium simulation, an astrophysical simulation created to investigate how the universe evolved over time

• All pages with titles beginning with millennium
• All pages with titles containing millennium
• Millennials, a name given to Generation Y, a demographic cohort
• Millennium Tower (disambiguation), the name of a number of buildings around the world
• Millennium Park (disambiguation), a few parks in North America
• Millennium Bank (disambiguation)
• Millennium Bridge (disambiguation)
• Millennium Institute (disambiguation)
• Willennium, a 1999 album by Will Smith