Thread:Project:Support desk/Is it allowed to advertise on wiki pages ?/reply

If you own the wiki (that you are hosting yourself), you can use it for any purpose whatsoever, including commercial purposes.

If your wiki is being hosted by someone else for you (for free, or you are paying them), they may have restrictions on what you can do with it. If you're paying them its unlikely they would restrict advertising, but free wiki-hosts may.