O18 or O-18 may refer to:

Places Airports Hanford Municipal Airport, in California, United States; formerly assigned FAA LID O18 Buzzards Roost Airport (FAA LID O18), Inola, Oklahoma, USA; see List of airports in Oklahoma

Rail stations Tondabayashi Station (station code O18), Tondabayashi, Osaka Prefecture, Japan Xinzhuang metro station (station code O18), Xinzhuang District, New Taipei, Taiwan

Literature Naos (hieroglyph) (Gardiner code O18), an Egyptian hieroglyphic representing a shrine Minuscule 442 (Soden code O18), a Greek New Testament minuscule manuscript Minuscule 441 (Soden code O18), a Greek New Testament minuscule manuscript

Other uses Curtiss O-18 Falcon, an observation aircraft of the United States Army Air Corps Oxygen-18, an isotope of oxygen Delta-O-18, a measure of the ratio of stable isotopes 18O:16O (oxygen-18:oxygen-16) MSC(O)-18, minesweeper built for the United States Navy during World War II over age 18 (O18), an age grouping, such as found in sports

See also

Canadian National Class O-18-a steam locomotives

018 (disambiguation) (zero-one-eight) 18O (disambiguation) 18 (disambiguation) O (disambiguation) U18 (disambiguation)