Board Thread:Support Requests - Getting Technical/@comment-24651817-20151217010205/@comment-3474542-20151217065145

You can only use the fonts that the user has installed to their computer, or that Wika has embedded to the wiki, on your wikis pages.

If it is a Google font, you can import it. See Help:How_to_import_Google_Fonts for details.

For custom fonts, you will first have to ask Staff to upload it for embedding. Use Special:Contact, and make sure to include the licensing info for that font (including permission to use, if needed).

Once your font is uploaded or imported, you can use it like any other standard font on your wiki's CSS page.