Board Thread:Support Requests - Designing Your Wiki/@comment-24078842-20131022030041/@comment-5431054-20131022061808

You can embed it, but you need to be an admin on the wiki you want to do it on. If you can get the embed code for your spreadsheet, (you can read the google help page here), copy the code onto a page in the MediaWiki namespace (like MediaWiki:Spreadsheet1 for example). On the page you want to insert the spreadsheet, place  and your spreadsheet should appear.