Seer, SEER, or Seers may refer to:

• A clairvoyant, prophet, oracle, or diviner
• The Seer (Charmed), a fictional character on the television series Charmed
• Brahan Seer, a legendary seer connected with Brahan Castle in Dingwall, Scotland

The efficiency of air conditioners is often rated by the Seasonal Energy Efficiency Ratio (SEER) which is defined by the Air Conditioning, Heating, and Refrigeration Institute in its 2008 standard AHRI 210/240, Performance Rating of Unitary Air-Conditioning and Air-Source Heat Pump Equipment. A similar standard is the European seasonal energy efficiency ratio (ESEER).