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18 may refer to:
- Council of 18, group of protesters during the MicroWiki@Discord Administrative Protests of 2020
- MicroWiki@Discord Administrative Protests of 2020, also known as The 18% Movement
- 18+, a content rating of the Amalgamated Film Rating Board
- R18, also called 18, a former content rating used by the Official New Eiffel Ratings Board
- 18+, a content rating of the Mahusetan Contentwatch
- List of highways numbered 18
- Shortening for the year 2018