MyBB Community Forums

Can I allow users of a certain usergroup the ability to change their theme but stop users in other groups from changing their's?

Technically, yes.

If you open the theme settings, you can choose which usergroups can see and use each theme. You can't actually stop a specific usergroup from changing their theme, but if you give some usergroups only one to choose from, they'll only see that one, and you can then show other themes to other usergroups.