OR and/or or may stand for:

• In logic, the or operator that captures some of the meaning of the English conjunction "or"; see Logical disjunction.
• In electronics, the or operator is carried out by a 4071 IC
• In computer programming, or can refer to both propositional and bitwise operators in various languages
• In heraldry, Or is the tincture with the colour gold (or yellow). It is usually spelt with a capital letter to distinguish it from the conjunction.
• In the Dungeons and Dragons World of Greyhawk campaign setting, OR is an abbreviation of Oeridian Record, or Oeridian Reckoning.
• In Medicine an Operating Room.
• Arkefly airline IATA code
• Old Rugbeian, a former pupil of Rugby School.
• Oregon, abbreviation for the US state.
• Oristano, abbreviation for the Italian comune.
• Oriya language (ISO 639 alpha-2, or).
• 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 statistics OR is the abbreviation for odds ratio
• In Olympic Games OR is the abbreviation for Olympic Record.
• Owasco River Railroad .
• 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.
• Or, a London-based computer-music record label since 1998.
• Or Music, a New York-based independent record label since ca. 2002 founded by a former Epic executive ^*.
• Optima Regal, Korean car built by Kia Motors.
• Organic code in OR.
• Official Receiver.

OR | OR | Or | OR | OR | OR | OR | OR | OR | OR | Диз'юнкція