OER

OER or Oer may refer to:

• Odakyu Electric Railway, a Japanese railway company
• Oer family, a German noble family
• Oer-Erkenschwick, a town in North Rhine-Westphalia, Germany
• Offense efficiency rating, the average number of points scored per shot by a basketball player
• Officer Evaluation Report, an evaluation form used by the United States Army
• Open educational resources, open documents that are useful for teaching, learning, educational, assessment and research purposes
• Oregon Electric Railway, an interurban railroad line in Oregon, United States
• Örnsköldsvik Airport in Örnsköldsvik, Sweden
• Oxygen enhancement ratio, effect magnitude of ionizing radiation due to the presence of oxygen
• Oxygen Evolution Reaction, the formation of oxygen by electrochemical reduction of water
• Owner’s Equivalent Rent, an economic metric for housing prices often used in the calculation of market baskets