How to Cite Wikipedia in Chicago 17 Format

Wikipedia presents a unique challenge for Chicago-style citations. Because its articles are collaboratively written, continuously updated, and lack named authors, they don't fit neatly into standard citation templates. The Chicago Manual of Style, 17th edition, treats Wikipedia entries similarly to encyclopedia articles — but with important differences regarding authorship, dates, and URLs. Most instructors and publishers discourage using Wikipedia as a primary source, but when you do reference it, citing it correctly demonstrates academic rigor.

This guide covers footnote and bibliography formatting for Wikipedia articles following Chicago 17th edition rules, with realistic examples and common pitfalls to avoid.

Note that Wikipedia is treated as the corporate author. Chicago 17 does not require individual contributor names since articles are collaboratively edited.

Where to Find Citation Information on Wikipedia

One of the trickiest parts of citing Wikipedia is locating the right details. Here's exactly where to find each element:

Article Title

The article title appears as the main heading at the top of the page. Use the exact title as displayed, preserving capitalization. Enclose it in quotation marks in your citation.

Last Modified Date

Scroll to the very bottom of any Wikipedia article. You'll see a line reading something like "This page was last edited on 15 January 2026, at 03:42 (UTC)." Use this date as your "last modified" date. This is essential because Wikipedia content changes frequently.

Permanent Link (Permalink)

For a citation that points to the exact version you consulted, use Wikipedia's permalink feature. In the left sidebar under "Tools," click "Permanent link." This generates a URL with an oldid parameter (e.g., https://en.wikipedia.org/w/index.php?title=Article_Title&oldid=123456789). Chicago recommends using permalinks when precision matters, such as in published scholarship.

Access Date

Record the date you viewed the article. Because Wikipedia is constantly edited, the access date tells readers which version you likely saw. Chicago generally considers access dates optional for stable sources, but for Wikipedia they are strongly recommended.

Language Edition

If you're citing a non-English Wikipedia edition, note the language subdomain (e.g., fr.wikipedia.org for French). Mention this in your citation so readers know which edition you consulted.

Detailed Examples

Example 1: Standard Wikipedia Article

Scenario: You're referencing the Wikipedia article on climate change for background context in a research paper.

This is the most common pattern. Wikipedia serves as the author, the article title goes in quotation marks, and both the last modified date and access date are included.

Example 2: Using a Permalink for a Specific Version

Scenario: You're writing a media studies paper analyzing how Wikipedia's article on the 2024 U.S. presidential election evolved over time. You need to cite the exact version you examined.

The permalink URL is longer, but it ensures anyone who follows it sees the exact revision you referenced. This is especially important in published work or when tracking how content changes over time.

Example 3: Non-English Wikipedia Edition

Scenario: You're researching the French perspective on existentialism and consulted the French-language Wikipedia article.

Adding "(French edition)" clarifies which language version you used. This distinction matters because different language editions are independently written and may contain different information.

Example 4: Wikipedia Article Cited in a Footnote-Only Paper (No Bibliography)

Scenario: Your instructor requires footnotes only, with no bibliography page. You're referencing the article on quantum computing in a short essay.

When no bibliography is required, your first footnote must contain all the information a reader needs to locate the source. The shortened form is used for all subsequent references to the same article.

Step-by-Step Instructions

Creating a Footnote

1. Start with the author. Write "Wikipedia" followed by a comma. Wikipedia is treated as a corporate author since no individual author is identified.
2. Add the article title. Place the exact article title in quotation marks, followed by a comma. Use headline-style capitalization (capitalize major words).
3. Include the last modified date. Write "last modified" followed by the date in Month Day, Year format, then a comma.
4. Include the access date. Write "accessed" followed by the date in Month Day, Year format, then a comma.
5. Add the URL. Paste the full URL (or permalink) with no period at the end. Chicago 17 omits the trailing period after URLs to prevent confusion.

Creating a Bibliography Entry

1. Start with the author. Write "Wikipedia" followed by a period.
2. Add the article title. Place the title in quotation marks followed by a period inside the closing quotation mark.
3. Include the last modified date. Write "Last modified" (capital L) followed by the date and a period.
4. Include the access date. Write "Accessed" followed by the date and a period.
5. Add the URL. Paste the full URL. No period follows the URL.

Notice the key structural differences between footnotes and bibliography entries: footnotes use commas to separate elements, while bibliography entries use periods. The bibliography entry begins with "Wikipedia." as a standalone sentence element, and subsequent elements are also sentence-capped.

Common Mistakes When Citing Wikipedia

1. Omitting the Last Modified Date

Because Wikipedia changes constantly, the last modified date is essential. Without it, readers cannot determine which version of the article you consulted. Always scroll to the bottom of the article to find this date.

2. Listing Individual Contributors as Authors

Wikipedia's "View history" tab shows individual editors, but Chicago style does not require listing them. Use "Wikipedia" as the corporate author. The collaborative nature of Wikipedia means no single contributor can be considered the author.

3. Using the Mobile URL

Mobile Wikipedia URLs (e.g., en.m.wikipedia.org) should be converted to the standard desktop URL (en.wikipedia.org) before citing. Remove the m. from the domain.

4. Italicizing the Article Title

Wikipedia article titles go in quotation marks, not italics. Italics are reserved for the titles of complete, self-contained works (books, journals, websites as a whole). A Wikipedia article is a component of the larger Wikipedia site, similar to an encyclopedia entry.

5. Treating Wikipedia as a Published Encyclopedia

Unlike Encyclopædia Britannica, Wikipedia is not a traditionally published reference work. Do not add a publisher, place of publication, or edition number. The URL and dates are sufficient to identify the source.

6. Forgetting the Access Date

While Chicago 17 generally treats access dates as optional for published online sources, Wikipedia is an exception. Because any article can change at any moment, including the access date is strongly recommended — and many instructors require it.

Special Considerations

Should You Use a Permalink?

For coursework and informal writing, the standard article URL is usually sufficient as long as you include the last modified date. For published scholarship, theses, and dissertations, use a permalink. The permalink guarantees your reader sees the same content you did, even if the article is later revised or the section you referenced is removed.

Wikipedia in Notes-Bibliography vs. Author-Date

The examples above follow the notes-bibliography system, which is the more common Chicago format for humanities papers. If your field uses the author-date system, Wikipedia citations can be awkward because there is no individual author or traditional publication date. In author-date, you would use an in-text parenthetical like (Wikipedia 2026) and include a corresponding reference list entry. However, most style guides and instructors prefer the notes-bibliography approach for sources like Wikipedia.

When Instructors Don't Accept Wikipedia

Many instructors prohibit Wikipedia as a cited source. Even when this is the case, Wikipedia can still be useful as a starting point for research. Check the "References" and "External links" sections at the bottom of Wikipedia articles — these often point to peer-reviewed journal articles, books, and primary sources that you can cite instead.

Frequently Asked Questions

Can I cite Wikipedia in an academic paper?

Chicago 17 provides formatting guidance for citing Wikipedia, so technically, yes. However, most academic publishers and instructors discourage or prohibit it as a cited source because its content is not peer-reviewed and can change at any time. If you do cite it, follow the formatting above precisely and consider whether a more authoritative source might serve your argument better. For full Chicago formatting rules, see our Chicago 17th Edition guide.

Do I include Wikipedia in my bibliography?

It depends on context. Chicago 17 notes that well-known reference works (like encyclopedias) are often cited in notes only and omitted from the bibliography. Wikipedia can be handled the same way. However, if your instructor requires all cited sources in the bibliography, include it. When in doubt, add the bibliography entry — it's better to over-cite than under-cite.

How do I cite a specific section of a Wikipedia article?

If you're referencing a particular section, you can indicate it in the footnote after the article title — for example: Wikipedia, "Quantum Computing," under "History," last modified March 1, 2026, accessed March 4, 2026, followed by the URL. Using a section-specific URL (with a # anchor) is also acceptable, though be aware that section headings may change as the article is edited.

What if the Wikipedia article has been deleted or merged?

If the article no longer exists at the URL you originally consulted, this is exactly why access dates and permalinks matter. Include the access date to show when you viewed the content, and if possible, use a permalink URL that points to the archived revision. If you used the standard URL and the article has since been deleted, note in your citation that the page is no longer available, or locate the content through Wikipedia's deletion log or the Wayback Machine.

Summary

Citing Wikipedia in Chicago 17 format is straightforward once you understand the pattern: treat Wikipedia as the corporate author, put the article title in quotation marks, and always include both the last modified date and your access date. Use permalinks for published work. For more detailed guidance on the Chicago webpage citation format that Wikipedia entries are based on, or for a comprehensive overview of all Chicago rules, see our Chicago 17th Edition citation guide.