I had a Restricted Stock Award Vest this year and cashed it out. This shows on my W2 as income, so do I need to enter the 1099-B in?

Yes, you will have to report the sale of the stock on Form 1099-B.

There are two separate events taking place.  

The vesting of the options, which is ordinary income reported on your W-2. 

 Second, the sale of the stock, which is usually reported on Form 1099-B.