ESR

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
• Ethnikó Simvúlio Radhiotileórasis (Greek: Εθνικό Συμβούλιο Ραδιοτηλεόρασης), 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 Union policy on greenhouse gas emissions