ESR may refer to:

Organizations

  • Earlham School of Religion, at Earlham College in Richmond, Indiana, US
  • E.S.R., Inc., a former American toy manufacturer
  • ESR Rīga, a Soviet Latvian football club, active from 1966 to 1991
  • ESR Technology, a UK company
  • e-Shang Redwood, an Asia focused Real Estate services and investment firm
  • (), the Greek National Council for Radio and Television
  • European Society of Radiology
  • Institute of Environmental Science and Research, a New Zealand scientific institute

Science

  • EISCAT Svalbard radar, UHF-band radar at Longyearbyen, Norway
  • Electron spin resonance, a technique used in chemical spectroscopy to identify unpaired electrons and free radicals
  • Electron spin resonance dating, a dating technique used in archaeology and geology
  • Erythrocyte sedimentation rate, the rate at which red blood cells sediment
  • Estrogen receptor, a group of proteins
  • European Sociological Review, sociological scientific journal

Technology

  • Electro-slag remelting, an alloy remelting and refining process
  • Electronic Staff Record, a human resources and payroll system of the UK National Health Service
  • Equivalent series resistance, the resistive parts of the impedance of certain electrical components
  • Emergency sun reacquisition, an attitude control mode of the Solar and Heliospheric Observatory
  • Extended-support release, software that receives official security updates for an extended period of time
  • M2010 Enhanced Sniper Rifle, a sniper rifle used by the US Army

Transportation

  • East Somerset Railway, a heritage railway in the UK
  • Eastar Jet (ICAO code), a Korean airline
  • Eastern Suburbs Railway, a railway line in Sydney, New South Wales, Australia
  • Ricardo García Posada Airport (IATA code), Chile
  • Emergency speed restriction, a UK railway speed reduction

Other uses

  • Eric S. Raymond (born 1957), American computer programmer, author and open source software advocate
  • Emile Smith Rowe, English professional footballer for Fulham FC
  • Effort Sharing Regulation a European regulation designed to allocate the Green House Gases reduction objectives among European Union Member States