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OR and/or or may stand for:
- In logic, or is a propositional operator that captures some of the meaning of the English conjunction "or"; see Logical disjunction. In computer programming, or and/or OR can also be a bitwise operator.
- In heraldry, Or is the tincture with the colour golden (or yellow). It is usually spelt with a capital letter to distinguish it from the conjunction.
- Oregon, abbreviation for the US state
- Oristano, abbreviation for the Italian comune
- Oriya language (ISO 639 alpha-2, or)
- Operating Room
- In applied mathematics, OR is an abbreviation for Operations Research, or Operational Research, the use of mathematical models, statistics and algorithms to aid in decision-making.
- In Olympic Games OR is the abbreviation for Olympic Record.
- Owasco River Railroad Template:Reporting mark
- Outdoor Research, a manufacturer of sporting equipment is also referred to as OR
- Or (Afghanistan), a location in Afghanistan.
- Or (Crimea), a region in Crimea.