No LIBRARY folder in Finder

It's not missing, it's just hidden. In Mountain Lion Apple decided to hide it so that less tech savvy users couldn't screw anything up. Option click when in the Go menu option and you'll see it.

 

With Lion (10.7) the Library in your home folder is hidden by default.

To view it make sure Finder is selected, click on Go in the menu bar and hold down alt/option, the Library option will appear. You can then click on it to view your users library.

 

Your Library folders are hidden by default in Lion and ML. To get to your /Library or /Users/yourusername/Library (also known as the ~/Library) folders in Lion and ML:

• Launch Finder and click Go > Go to Folder and type: /Library or ~/Library
• Hold the Option key while clicking the Go menu item, which reveals your ~/Library folder in the menu.
• Make it permanently visible in Finder by entering the following command in Terminal, then press the Enter key:
  chflags nohidden ~/Library​
• 18 ways to view the ~/Library folder in Lion

 

For the sake of accurate terminology: Finder is the program that shows you your files.
The Library folder is, by default, hidden in your User account (also known as user domain, user home).

So, you should have two Library folders, one at the root level ("under the HDD"); one in your user account: and you can view them both using the Finder!

Hope this helps. The other posts have dealt with how to reveal the user Library.

 

If you'd like a permanent fix to this go to your terminal and type this:

chflags nohidden ~/Library

This will make it so the Library is no longer a hidden folder.

 

No, three. One in System as well.

 

Well, yes. But attempt no landings there.

 

However, it seems that sometimes software update (like 10.8.4 - 10.8.5) will re-hide the ~/Library folder, requiring doing the chflags again.

 

There is a checkbox in Mavericks View options to show the user Library.