European Journal of Operational Research
{{Infobox journal
| title = European Journal of Operational Research
| image =
| caption =
| former_name =
| abbreviation = Eur. J. Oper. Res.
| mathscinet = European J. Oper. Res.
| discipline = Operational research
| language =
| editor = Roman Słowiński
| publisher = Elsevier on behalf of the Association of European Operational Research Societies
| country =
| history = 1977–present
| frequency = 24/year
| openaccess =
| license =
| impact = 6.4
| impact-year = 2022
| ISSN = 0377-2217
| eISSN =
| CODEN = EJORDT
| JSTOR =
| LCCN = 77643872
| OCLC =
| website = http://www.journals.elsevier.com/european-journal-of-operational-research/
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| link1-name =
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}}
The European Journal of Operational Research (EJOR) is a peer-reviewed academic journal in operations research. It was founded in 1977{{Cite journal |title=Forty years of the European Journal of Operational Research: A bibliometric overview |journal=European Journal of Operational Research | volume=262 |issue=3 | pages=803–816 |doi=10.1016/j.ejor.2017.04.027 |issn=0377-2217|year=2017 |last1=Laengle |first1=Sigifredo |last2=Merigó |first2=José M. |last3=Miranda |first3=Jaime |last4=Słowiński |first4=Roman |last5=Bomze |first5=Immanuel |last6=Borgonovo |first6=Emanuele |last7=Dyson |first7=Robert G. |last8=Oliveira |first8=José Fernando |last9=Teunter |first9=Ruud |url=https://www.rug.nl/research/portal/en/publications/forty-years-of-the-european-journal-of-operational-research(e79524f2-e0b1-4212-9348-85dc81937d71).html |hdl=11370/e79524f2-e0b1-4212-9348-85dc81937d71 |hdl-access=free }} by the Association of European Operational Research Societies,{{citation|url=https://www.euro-online.org/web/pages/1576/orms-article-euro-faces-40|title=International O.R.: EURO faces 40. An inside look at the past, present and future of the Association of European Operational Research Societies|publisher=Association of European Operational Research Societies|journal=INFORMS ORMS-Today|volume=41|issue=2|date=April 2014|first1=Gerhard|last1=Wäscher|first2=Sarah|last2=Fores}} and is published by Elsevier, with Roman Słowiński as its Co-ordinating Editor.{{citation|url=http://www.journals.elsevier.com/european-journal-of-operational-research/|title=European Journal of Operational Research|publisher=Elsevier|accessdate=2016-01-25}} Currently, it publishes at a rate of 24 issues per annual volume, with approximately 250 pages per issue.
It is a top journal (CABS 4; ABDC A*) and the primary journal for Europe-based studies of operations research. It is the world's largest operations research journal.{{citation|title=The Rocky Road to Publishing in the Management and Decision Sciences and Beyond: Experiencing the Journey and Lessons Learned|series=SpringerBriefs in Business|first1=Pekka|last1=Korhonen|first2=Herbert|last2=Moskowitz|first3=Jyrki|last3=Wallenius|publisher=Springer|year=2014|isbn=9783642420481|page=159|url=https://books.google.com/books?id=aFHABAAAQBAJ&pg=PA159}} For most years since 1999 it has been ranked by SCImago Journal Rank as a top-quartile journal in information systems and management, management science and operations research, and modeling and simulation.{{citation|url=http://www.scimagojr.com/journalsearch.php?q=22489&tip=sid|title=European Journal of Operational Research|publisher=SCImago Journal Rank|accessdate=2016-01-25}}