• Atom (time), a medieval unit of time
• Atom (measure theory), a minimal measurable set
• Atom (order theory)
• Atomic formula, a single predicate in first-order logic
• Atom, an urelement in set theory

Hardware edit

• Intel Atom, a line of microprocessors
• Atom (system on chip), an Intel system on chip platform for smartphones and tablets
• Acorn Atom, an early 1980s home computer

Software edit

• Atom (web standard), an XML-based web syndication format
• Atom (programming language), a programming language for real-time embedded software
• Atom (text editor), a deprecated programming text editor developed by GitHub
• AtoM (archival software), an open source software for archival description and access
• Atoms, a fundamental scalar data type in the Lisp programming language, see Lisp (programming language)#Atoms
• A synonym for symbol in some programming languages

• Ariel Atom, a high performance sports car
• Aston Martin Atom, a 1939 prototype car
• ATOM (IFV), an infantry fighting vehicle jointly developed by Russia and France
• Ozone Atom, a French paraglider design

• Atom (Asimov book), 1991 nonfiction book by Isaac Asimov
• Atom (Krauss book), 2001 nonfiction book by Lawrence M. Krauss
• Atom (character), several fictional comic book superheroes from the DC Comics universe
• Atom: The Beginning, Japanese manga series
• Captain Atom, a Charlton Comics superhero
• Atom, the narrator of The History and Adventures of an Atom satire by Tobias Smollett

• Atom™, an alias of the German musician Uwe Schmidt (born 1968)
• Atom, an album by Moonbeam
• A.T.O.M (A Twist of Modern), an album by Carbon/Silicon
• "Atom", a song by British Sea Power
• "Atom," a song by Cannibal Ox from The Cold Vein
• Atomi, a Yugoslav rock band

• Atom (martyr), a Christian martyr
• Arthur Thomson (fanzines) or ATom (1927–1990), British science fiction artist and writer
• Atom Araullo, a Filipino broadcast journalist
• Atom Egoyan, a Canadian stage and film director, writer and producer
• Maxwell Atoms (born 1974), American animator

• Philadelphia Atoms, American soccer team (1973–1976)
• Philadelphia Atoms SC, American soccer team (founded 2017)
• Jersey City Atoms, a former American basketball team
• Tri-City Atoms, various American minor league baseball teams from Washington
• Pohang Atoms, a former name of the Pohang Steelers, Korean association football team
• Atoms, the sports teams of Annandale High School in Virginia

• A.T.O.M. (TV series), a toy line or its associated animated series
• Atom.com, a former on-line video producer, formerly AtomFilms
  • Atom TV, a television series featuring content from Atom.com
• Springfield Atoms, the fictional football team from Springfield in The Simpsons
• The Atom (1918 film), a 1918 silent film directed by Frank Borzage
• "Atoms", a Series A episode of the television series QI (2003)

• Atom Bank, a digital finance company
• Ancient Teachings of the Masters, a new religious movement
• The Atom (sculpture), in Pendle, Lancashire, England
• A British publisher owned by Little, Brown Book Group
• An object lacking proper parts; see Mereology § Axioms and primitive notions
• Atoms (brand), a footwear brand

• Atom and His Package, a band whose sole human member is Adam Goren
• Atomic (disambiguation)
• Atomicity (disambiguation)
• Atomism, philosophy about the basic building blocks of reality
• Nuclear (disambiguation)
• Atum, an ancient Egyptian deity
• Adam (disambiguation)
• All pages with titles beginning with Atom
• All pages with titles containing Atom