O18 or O-18 may refer to:

Places

Airports

Rail stations

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

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