Where is SQL Server Management Studio 2012?

You can get SSMS Express tools from here or full SQL Server Eval tools from here. MSDN/TechNet Downloads is currently the only place to get RTM versions (non-eval) of the SSMS 2012 toolset.

Note the first link now(dec 2017) points to 'Microsoft® SQL Server® 2012 Service Pack 2 (SP2) Express'. ssms 2014 and 2017 are still available.

I just ran into this problem. I had to open back the installation for SQL Server and click Installation -> New SQL server installation or add features to existing installation. Then when we follow the instruction until we reach feature selection, just check the SQL Management tools checkbox and continue.

I have no idea why this software is considered a feature and hidden like this. It should be a stand-alone software installation.

Just download SQLEXPRWT_x64_ENU.exe from Microsoft Downloads - SQL Server® 2012 Express with SP1