|Provides a link to Wikipedia's article about the feature.|
|Used on these elements|
|Status: de facto|
|Tools for this tag|
Use wikipedia=language:page title to provide a reference to an article in Wikipedia about the feature.
A Wikipedia link can be associated with any OSM object. Some helpful guidelines:
- Only provide, in normal circumstances, a link to a single Wikipedia article, which should be to the article in the primary (local) language for the subject. In some cases, links to articles in non-local languages can be appropriate.
- Always include a language prefix, e.g. 'en:St Paul's Cathedral', (en: for English, in that case) rather than assuming any particular language as with 'St Paul's Cathedral'.
- Use the human readable title of the article, for example 'en:St Paul's Cathedral' rather than the version with underscores and URL-encoded characters that is used in the URL ('St_Paul%27s_Cathedral')
- When you link to a section of a page, the spaces must be replaced by underscores. wikipedia=language:page title#section_of_the_page. Generally, do not do this; look for a redirect to that section whose full title matches the item you are linking from.
- Only provide links to articles which are 'about the feature'. A link from St Paul's Cathedral in London to an article about St Paul's Cathedral on Wikipedia is fine. A link from a bus depot to the company that operates it is not (see section below).
- Provide, for an extensive feature encompassing many individual ways, such as a long railway line or river, a single Wikipedia link from a relation covering the entire feature rather than attaching a link to every single way individually.
- Avoid full URLs such as 'https://en.wikipedia.org/wiki/St_Paul%27s_Cathedral'.
- Avoid redirects, for example, link to de:Frashër and not to de:Frasher (which is a redirect).
- Note that many objects have no matching Wikipedia article. For example, a typical supermarket has no Wikipedia page about it. There may, however, be an article about the company, which can be tagged using brand:wikipedia=*.
The following examples show Wikipedia links in use; the data is used to create a link to the Wikipedia article in the appropriate language:
In almost all cases, a single wikipedia tag using the primary language for the subject, as described above, is sufficient. Data users can access articles in other languages where available using Wikipedia's interlanguage links. If interlanguage links are missing, this should usually be fixed within Wikipedia (more specifically, in Wikidata).
One example where it is appropriate to provide additional explicit links to articles in secondary languages is when there is no existing article about the object in the local language. For example, for museums in France, French Wikipedia is preferred, but linking to the English article about the particular museum in France is OK if there is no matching article in French Wikipedia. In these circumstances, use the format wikipedia:lang=page title (e.g. wikipedia:en=*) for the secondary languages.
You may tag secondary attributes of the feature by preceding the wikipedia=* key with the name of the attribute, separated by a colon (:). The value of such a key would be the same as the normal wikipedia=* key but referring to the appropriate Wikipedia page.
Other possible attributes include architect:wikipedia=* (for a building), artist:wikipedia=* (for public artworks), subject:wikipedia=* (for memorials, plaques, statues, etc), name:wikipedia=* (to indicate which person or event is related to the name of the feature, such as John F. Kennedy to the John F. Kennedy International Airport). Other common ones include operator:wikipedia=*, network:wikipedia=* and species:wikipedia=*. For a list of all secondary attributes currently being tagged with this key, see taginfo.
In the past, the name of the attribute was put after the key (e.g. wikipedia:operator), but this was deprecated because it creates a conflict with the way secondary languages are linked.
It may be more useful to store certain data on Wikidata. For example, instead of using name:etymology:wikipedia=* or name:etymology:wikidata=* one may follow the Wikidata link from wikidata=* and use data stored in P138 property on Wikidata page of this object.
Occasionally, a feature may have one or more secondary links, but no primary link. For example, a memorial depicting a famous event may have only a secondary subject:wikipedia=* link. Monuments, memorials, statues, and similar features should have wikipedia=* only if they have their own Wikipedia article. The same applies to chain stores.
You can add or update the wikipedia key by pasting the full article url in the Wikipedia property. It also adds the wikidata=* key. See this video for an example: https://www.youtube.com/watch?v=FkqPLzIUr1k (note that you don't need to remove the previous wikipedia key)
- Wikipedia Link Improvement Project
- Collaboration with Wikipedia - information about broader collaboration between OSM and Wikipedia
- A tool to set this key: JOSM/Plugins/RemoteControl/Add-tags
- wikidata=* to link the feature to Wikidata, in addition to Wikipedia (It's far from unusual to see Wikipedia articles renamed and consequently links to them rendered malfunctional. The associated Wikidata items are more stable)
- WIWOSM - uses wikipedia=* to display vector map at Wikipedia sites using OSM data
- website=* for the URL of an official website for the feature
- url=* for the URL of reliable and relevant 3rd party websites.
- https://openstreetmap.pl/wp/index.xhtml - Visualization of linked Wikipedia articles
- https://www.freemap.sk/#map=8/48.978359/20.536089&layers=Xw - also shows Wikipedia articles as they are linked from OSM objects (ignores often imprecise location data at Wikipedia)