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Yeah, but you don't want it. Its a discontinued, slow lens. You can do much better for about the same price, unless you're paying less than $15.
 
Will a sigma 28-105 F3.8-5.6 UC3 fit and or work on a nikon d80

Sory to state the obvious but you did say you were new...
If the lens has a Nikon mount it will fit the D80. Sigma made that same lens in various mounts for Canon and so on.

It is kind of a cheap lens. Seems after springing for the nice D80 you'd want some first rate lenses. I would much rather buy a used Nikon than a low-end Sigma If budge is an issue buy used lenses.
 
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