Confluence - Can I take the rights to see a blog away from certain users?

I would like some users to NOT have access to the blog in a certain space. Is that possible?

Yes, it’s possible and very easy to do. If you know already how to restrict a page, it’s the same process.

On a published blog you go to: the three dots on the top Confluence menu and click Restrictions. There you can choose who you want to restrict.

More about blogs in the Atlassian documentation: Blog Posts | Confluence Data Center and Server 8.0 | Atlassian Documentation