Notion may refer to:
- Notion (ancient city), a Greek city-state on the west coast of Anatolia
- Notion (philosophy), a reflection in the mind of real objects and phenomena in their essential features and relations
- Notions (sewing), small articles used in sewing and haberdashery
- Notion, ancient name of Mizen Head in Ireland
- Notions (Winchester College), the Winchester slang
- Johnnie Notions, Shetland smallpox inoculator
Software
- Notion (app), note-taking application that also integrates tasks, wikis, and databases.
- Notion (software), music composition and performance computer program
- Notion, the successor to the Ion window manager
Music
- Notion (magazine), a UK music and fashion quarterly
- Notion (EP), by Tash Sultana, 2016
- "Notion" (Kings of Leon song), 2008
- "Notion" (Tash Sultana song), 2016
See also
- Meaning (disambiguation)