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, 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 Arsenal FC
 * Effort Sharing Regulation a European regulation designed to allocate the Green House Gases reduction objectives among European Union Member States