I believe the answer is that there are two 'Library' folders affecting each user on OS X. One is in /Library and the other is in /Users/MyUserName/Library. Plist fiels stored in /Library affect all users while ones in /Users/MyUserName/Library affect only the user concerned.
If you let us know why you want to know this then we can probably be more help. In general though, there is no single registry, just a large number of plist files pertaining to different programs. Usefully if things go wrong you can often just trash a plist file to fix the issue as the system will recreate them from scratch automatically.
As wikipedia says:
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An advantage of this is that corruption to one of these files will normally only affect a single application, whereas corruption of one of the Registry hives can have system-wide effects.
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If you are moving to Mac you will find while some Windows things have direct equivalents many others do not as the systems are really quite different.