The pages in this category are redirects from ISO 639 language codes (in the format ISO 639:xxx). To add a redirect to this category, place ((Rcat shell|((R from ISO 639 code)))) on the second new line (skip a line) after #REDIRECT [[Target page name]]. For more information follow the links. Never substitute redirect template(s), nor place them on soft redirects. See also the complete list of redirect templates and the redirect style guide.

This is a maintenance category, used for maintenance of the Wikipedia project. It is not part of the encyclopedia and contains non-article pages, or groups articles by status rather than subject. Do not include this category in content categories. This is a tracking category. It builds and maintains a list of pages primarily for the sake of the list itself. They are not part of the encyclopedia's categorization scheme. This category is hidden on its member pages—unless the corresponding user preference (Appearance → Show hidden categories) is set. These categories can be used to track, build and organize lists of pages needing "attention en masse" (for example, pages using deprecated syntax), or that may need to be edited at someone's earliest convenience. These categories also serve to aggregate members of several lists or sub-categories into a larger, more efficient list (discriminated by classifications).

These codes are sorted by their code letters, (xxx), without the "ISO 639:" prefix.

Some pages of this format will not be redirects but disambiguation pages between two or more languages. This is especially true of the collective codes of ISO 639-2, e.g. ISO 639:art, and for the ISO 639 macrolanguages, e.g. ISO 639:zho.

This category is maintained by PotatoBot's Task 2.

The entries in the subcategories of Circular and Dubious links may need to be changed if articles are created for them, or if the language they are merged into is changed. The Retired subcat also contains a code which may be changed (as noted in its header).