Wiki, Is it possible to give access to single users on a given wiki page?

While it is possible to use page restrictions to restrict access to specific pages within your wiki space, this is not recommended, as the process is error prone and difficult to manage.

You can find instructions for adding users and groups to your entire wiki space in the Wiki Documentation here: https://wiki.illinois.edu/wiki/display/HELP/Adding+Space+Permissions+for+Campus+Users

If you would still like to use page restrictions to restrict access to specific pages within your wiki space, instructions for doing so are found here: https://wiki.illinois.edu/wiki/display/HELP/Using+Page+View+Restrictions