Internet Encyclopedia of Philosophy
Type of site
Online encyclopedia
Created byJames Fieser
Launched1995; 29 years ago (1995)

The Internet Encyclopedia of Philosophy (IEP) is a scholarly online encyclopedia, dealing with philosophy, philosophical topics, and philosophers.[1] The IEP combines open access publication with peer reviewed publication of original papers. Contribution is generally by invitation, and contributors are recognized and leading international specialists within their field.[1][2]


The IEP was founded by philosopher James Fieser in 1995, operating through a non-profit organization with the aim of providing accessible and scholarly information on philosophy.[3] The current general editors are philosophers James Fieser and Bradley Dowden, with the staff also including numerous area editors as well as volunteers.[4][2] The entire website was redesigned in 2009, moving from static HTML pages[citation needed] to the open-source content management system WordPress.[5]


The intended audience for the IEP is philosophy students and faculty who are not specialists within the field, and thus articles are written in an accessible style. Articles consist of a brief survey or overview, followed by the body of the article, and an annotated bibliography. Articles are searchable either by an alphabetical index or through a Google-power search mechanism.[2]


Similarweb analytics suggest that the IEP website is accessed worldwide between two and three million times per month.[6] Some 75% of this usage is through internet searches, 18% is through direct access, and 5% through referral, with the referring websites including other reference websites and university library guides.[6]


The IEP is included by the American Library Association in its listing of Best Free Reference Sites;[7] listed as an online philosophy resource by the Federation of Australasian Philosophy in Schools Associations;[8] listed by EpistemeLinks as one of the "outstanding resources" in philosophy on the internet;[9] and listed as a reliable resource in many university philosophy guides.[10]

See also


  1. ^ a b "Oxford University ARCH Project". Archived from the original on 16 May 2018. Retrieved 10 September 2017.
  2. ^ a b c Kooy, B. 2015. 'Internet Encyclopedia of Philosophy', in Reference Review, Vol. 29, No. 4, p. 12.
  3. ^ Kooy, B. 2015. 'Internet Encyclopedia of Philosophy', in Reference Review, Vol. 29, No. 4, p. 12; see also "About the IEP". Internet Encyclopedia of Philosophy.
  4. ^ "Law in Free Internet Encyclopedias of Philosophy (SEP & IEP)". The University of Chicago Library News. The University of Chicago Library.
  5. ^ "Welcome to the New IEP". Internet Encyclopedia of Philosophy. Retrieved 2023-07-29.
  6. ^ a b Similarweb data on IEP, at, accessed 18 September 2017.
  7. ^ "Best Free Reference Web Sites 2016 18th Annual List RUSA Emerging Technologies Section (ETS)". Reference & User Services Association (RUSA). December 29, 2016.
  8. ^ "Online guides to Philosophy". FAPSA.
  9. ^ "EpistemeLinks: Philosophy Resources on the Internet". Archived from the original on May 30, 2016.
  10. ^ "Philosophy: Philosophy eresources". LibGuides. Cambridge University Libraries.