8 Best Dissertation and Thesis Databases of 2026

1. 1

   ProQuest Dissertations & Theses Global

   Clarivate's licensed database of graduate dissertations and theses from universities around the world, with millions in full text.

   9.1overall

   Clarivate's licensed database of graduate dissertations and theses from universities around the world, with millions in full text.

   Best forGraduate students and faculty at institutions that subscribe, who need the most complete thesis search available.

   Adoption data

   3,600+ institutionsProQuest says its dissertation collection holds more than 6 million thesis citations from over 3,600 institutions in more than 70 countries.

   ProQuest (Clarivate), ProQuest Dissertations & Theses Global (2026): “ProQuest Dissertations and Theses Global with the Web of Science™ enables researchers to seamlessly uncover early career, post-graduate research in the form of more than 6 million dissertations and theses citations from over 3,600 institutions from more than 70 countries”

   ProQuest Dissertations & Theses Global is the reference database for graduate research. ProQuest reports over 6 million metadata records, of which 4 million are full text documents, drawn from universities on several continents. That depth matters when you need to show a committee that your question is new, or when a niche topic has little coverage in journals. Recent additions aim at graduate students directly: the ProQuest Research Assistant summarizes key takeaways and suggests research topics, while Foundational Research lists highly co-cited sources in a subject and Similar Dissertations surfaces related theses. The collection is also indexed in Web of Science as a citation index, so joint subscribers can link from an article search straight to thesis full text. The drawback is access. ProQuest sells it to libraries only and publishes no price, so a student without a subscribing institution cannot use it. Coverage outside North America is broad but not complete, so pair it with national portals such as EThOS.

   Strengths

   • +The largest thesis collection on this list by a wide margin
   • +Full text for most records rather than links elsewhere
   • +Tools built for dissertation research, not adapted from article search

   Limitations

   • −Only available through an institutional subscription
   • −No published price; libraries must contact sales
   • −Strongest for North American theses, so check national portals too

   SummaryIf your library subscribes, this is the first database to search for prior theses on any topic. Without institutional access, start with Google Scholar and the free portals below.

2. 2

   Google Scholar

   Google's free search engine for scholarly work, including theses, articles, books and abstracts.

   9.0overall

   Google's free search engine for scholarly work, including theses, articles, books and abstracts.

   Best forStudents who need one free search across theses and journal articles, with or without a library login.

   Adoption data

   36%NISO's summary of the Ithaka S+R US Faculty Survey 2021 reports that 36 percent of social sciences faculty and 30 percent of scientists in the U.S. begin their search for scholarly material on Google Scholar.

   NISO (reporting the Ithaka S+R US Faculty Survey 2021), Highlights of Ithaka US Faculty Survey 2021 (2021): “Larger shares of social scientists are using Google Scholar compared to their colleagues in other disciplines: 36 percent of social sciences faculty are starting their search here, compared to 30 percent of scientists and 12 percent of humanists.”

   Google Scholar is the fastest free way to see what exists on a topic, and Google lists theses among the material it searches, next to articles, books and abstracts from publishers, societies, repositories and universities. That makes it a practical first pass for a literature review: one query returns both published papers and the theses behind them. Ranking weighs the full text, where and by whom a work was published, and how often it has been cited, while Cited by and related article links let you follow a line of research. Library Links connect results to full text your institution licenses, at no cost to the library. For dissertation work the gaps are clear. There is no document type filter, so theses are mixed in with everything else, and Google does not publish what it covers, which makes a search hard to report in a methods section. Use it to scope a topic, then confirm in ProQuest, a thesis portal and a curated index.

   Strengths

   • +Free with no account needed
   • +Finds theses held in university repositories alongside journal articles
   • +Cited by links help trace a topic forward in time

   Limitations

   • −No filter to show only theses or dissertations
   • −Coverage is not published as a source list, so searches are hard to reproduce
   • −Fewer search controls than Web of Science or Scopus

   SummaryGoogle Scholar is the best free starting point for both theses and articles. Pair it with a dedicated thesis database when you need complete, reportable results.

3. 3

   EBSCO Open Dissertations

   A free EBSCO portal that indexes electronic theses and dissertations from university repositories and links to the originals.

   8.4overall

   A free EBSCO portal that indexes electronic theses and dissertations from university repositories and links to the originals.

   Best forStudents who want a free, thesis-only search across hundreds of universities.

   Adoption data

   325 universitiesEBSCO says 325 universities worldwide have loaded their theses and dissertations into Open Dissertations so far.

   EBSCO, EBSCO Open Dissertations (2026): “325 worldwide universities that have loaded their dissertations to date”

   EBSCO Open Dissertations is the most useful free portal for thesis searching that we could verify. EBSCO lists 2,000,000 electronic theses and dissertations from 325 universities that have loaded their records, and makes the index available on the open web at opendissertations.org as well as inside EBSCO subscriber platforms. Because the search returns only theses, it avoids the clutter of a general engine. The database grew out of American Doctoral Dissertations, which EBSCO and the H.W. Wilson Foundation built from a print index covering 1933 to 1955 and later extended to the present, so it also helps with older U.S. doctoral work. The trade-off is that EBSCO holds metadata, not files: records point to each university's repository, where the full text may or may not be open. Coverage depends on which universities take part, so it is a strong complement to ProQuest rather than a replacement.

   Strengths

   • +Free on the open web at opendissertations.org
   • +Search returns only theses and dissertations
   • +Historical U.S. doctoral indexing from 1933 onward

   Limitations

   • −Full text sits in each university repository, so availability varies
   • −Only covers universities that have chosen to contribute
   • −Far smaller than ProQuest's collection

   SummaryThis is the best free thesis-only search on the list. Expect to click through to university repositories for the full text.

4. 4

   JSTOR

   A nonprofit archive of academic journals, books and primary sources, with a personal plan for readers without a library.

   8.3overall

   A nonprofit archive of academic journals, books and primary sources, with a personal plan for readers without a library.

   Best forHumanities and social science students reading journal articles for a literature review.

   Adoption data

   14,000+ librariesJSTOR states that it works with more than 14,000 libraries around the world.

   JSTOR (ITHAKA), JSTOR for librarians (2026): “JSTOR is a mission-driven nonprofit working hand-in-hand with 14,000+ libraries worldwide to expand access to knowledge.”

   JSTOR is on this list for the second half of dissertation work: reading the journal literature your review has to cover. It describes itself as a nonprofit working with more than 14,000 libraries, and its platform holds 2,800+ academic journals with coverage that often reaches back to first issues, which helps when a review needs to trace how an idea developed. Students whose library subscribes read it free. Those who do not can buy JPASS, which JSTOR prices from $19.50 per month or $199 per year for unlimited reading across 2,400+ journals, with 10 PDF downloads a month on the monthly plan or 120 a year on the annual one. JSTOR is not a thesis database, and JPASS does not include every journal on the platform, so it will not tell you what recent graduates have written. Use it with ProQuest or a free thesis portal, and with Scopus or Web of Science for current articles.

   Strengths

   • +One of the few databases with a published personal price
   • +Deep back runs of journals for historical literature reviews
   • +Run by a nonprofit

   Limitations

   • −Not a thesis database, so use it alongside one
   • −Monthly JPASS allows 10 PDF downloads
   • −JPASS covers 2,400+ of the 2,800+ journals on the platform

   SummaryJSTOR is the best place on this list to read journal articles for a humanities or social science literature review. It is also the only option here with a published personal price.

5. 5

   Web of Science

   Clarivate's curated citation index, which can include ProQuest dissertations alongside journals, preprints and grants.

   8.3overall

   Clarivate's curated citation index, which can include ProQuest dissertations alongside journals, preprints and grants.

   Best forGraduate students running systematic or citation-based literature reviews at subscribing institutions.

   Adoption data

   10,000 organizationsClarivate says Web of Science supports research at 10,000 organizations worldwide.

   Clarivate, Web of Science platform (2026): “trust a resource that powers research at 10,000 organizations worldwide”

   Web of Science is the curated index to use when a literature review has to be complete and repeatable. Clarivate reports more than 34k journals, over 288m records and more than 3.4b citation links on the platform, with an archive going back to 1864, and says it supports research at 10,000 organizations. What lifts it on a thesis list is the ProQuest Dissertations & Theses Citation Index, which places ProQuest's dissertation records in the same search as journal articles, preprints and grants; Clarivate's blog notes the addition of more than 172 million cited references from those theses. Joint subscribers can jump from a result to ProQuest full text. The catch is that every part of this depends on what your institution licenses. Prices are not published, the thesis index is a separate product, and the interface rewards some training. For students whose library has both, it is the strongest single place to run a systematic search.

   Strengths

   • +Citation links make forward and backward searching easy
   • +Can include ProQuest theses in the same search as journal articles
   • +Selective, documented coverage suits reportable review methods

   Limitations

   • −Institutional subscription only, with no published price
   • −Thesis coverage depends on whether your library licenses the citation index
   • −Interface takes time to learn

   SummaryWeb of Science is the best curated index for a reportable literature review, especially where the library adds the ProQuest thesis index. Without a subscription, it is out of reach.

6. 6

   Scopus

   Elsevier's curated abstract and citation database of journals, books, conference papers and preprints.

   8.2overall

   Elsevier's curated abstract and citation database of journals, books, conference papers and preprints.

   Best forGraduate students running structured literature searches in science, health and social science.

   Adoption data

   3,000+ institutionsElsevier's support site says more than 3,000 academic, government and corporate institutions use Scopus; the page carries no date, so the current figure may differ.

   Elsevier, What is Scopus about? (2026): “Worldwide, Scopus is used by more than 3,000 academic, government and corporate institutions”

   Scopus is the other curated index most universities license, and for many science and health students it is where the formal literature search happens. Elsevier reports 100M+ records, including 404K+ books, 2.6M+ preprints and more than 25.2M+ open access documents, and its support site says more than 3,000 institutions use it. Author Profiles and citation metrics help when you need to judge which sources carry weight or who leads a subfield. For a thesis, Scopus answers the second of the three questions students ask, which is how to run a literature review, rather than the first, because Elsevier does not present a dissertation collection on its product page. Like Web of Science it indexes and links rather than hosting most full text, and its price is not published. If your library has both, choose the one your field and supervisor use, then add ProQuest or a thesis portal for prior theses.

   Strengths

   • +Broad, curated coverage for reproducible searches
   • +Strong author and citation tools
   • +Includes preprints and books alongside journals

   Limitations

   • −Institutional subscription only, with no published price
   • −Does not market a thesis or dissertation collection
   • −Abstracts and citations, not full text

   SummaryScopus is a strong curated index for literature reviews in science and health. It is not a source for prior theses, so pair it with ProQuest or EBSCO Open Dissertations.

7. 7

   CORE

   A not-for-profit aggregator of open access research from repositories and journals worldwide.

   8.1overall

   A not-for-profit aggregator of open access research from repositories and journals worldwide.

   Best forStudents who need free full text from university repositories for a literature review.

   CORE is a free way to reach open access full text, including material sitting in university repositories. It describes itself as a bibliographic database of the world's scholarly literature that collects research from repositories and journals, and says it is, to its knowledge, the largest collection of full text open access research papers, with over 400 million records and more than 40 million full text documents. For a dissertation that means two things: you can read many papers your library does not license, and you can reach repository content that general search engines index unevenly. CORE also offers an API and dataset for students doing text mining. It is not built for thesis searching, though, and it does not advertise a thesis filter, so expect to sort theses from articles yourself. Coverage is limited to open access work, and CORE does not publish a user count, so we scored adoption conservatively.

   Strengths

   • +Free, with a large open access full text collection
   • +Draws on university repositories, where many theses are deposited
   • +Community governed and not for profit

   Limitations

   • −Not a thesis-only database
   • −Only covers open access content
   • −No citable user count published

   SummaryCORE is a strong free source of open access full text for a literature review. Use a dedicated thesis portal for thesis-specific searches.

8. 8

   EThOS

   The British Library's free discovery service for UK doctoral theses.

   7.8overall

   The British Library's free discovery service for UK doctoral theses.

   Best forResearchers who need to find PhD theses awarded by UK universities.

   EThOS is back online after the cyber-attack on the British Library in 2023, and it remains the national index of UK doctoral theses. The British Library says the platform describes over 650,000 theses from UK universities from the 1700s onwards and aims to provide an aggregated record of all doctorates awarded by UK institutions. Many records carry an Access thesis from university button that leads to the repository record, where the thesis may be downloadable. The restored service is narrower than before. It is now metadata only, the library warns of a backlog still being worked through, and not every thesis has a repository copy. Updates for doctorates awarded since October 2023 arrive on a rolling basis. For anyone whose topic has a UK research base, it is still the quickest way to check what British PhD candidates have written, and it costs nothing. Students elsewhere will get more from ProQuest or EBSCO Open Dissertations.

   Strengths

   • +Free national record of UK doctoral theses
   • +Very long historical range
   • +Run by the British Library

   Limitations

   • −Metadata only since restoration after the 2023 cyber-attack
   • −Covers UK doctorates only
   • −British Library notes a backlog of content still being processed

   SummaryEThOS is the free place to check UK doctoral theses. Treat it as a finding aid, since full text now lives in university repositories.

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