[Bubba Ho-Tep]

Okay, here's a real-life situation: My great-grandfather came here from Italy in 1913 and was naturalized, renouncing his Italian citizenship, in 1943. Between those two dates, my grandfather was born and under Italian law, he was an Italian citizen (as the son of an Italian citizen). He never knew he had it, and thus never renounced it. My mother then inherited citizenship from him, and I from her.

If I go into an Italian consulate with all the paperwork indicating that chain --birth certificates, naturalization papers, marriage certificates, etc.--I can get an Italian passport. Understand, this isn't applying for Italian citizenship. This is proving that I'm already an Italian citizen.

So, here I am, the third generation born on US soil, but Italian law says I'm also an Italian citizen. Am I a natural born citizen?

[Godebert]

"Am I a natural born citizen?"

If you were born in the country to Citizens parents, then yes, you are a natural born Citizen.

[Lurkinanloomin]

Not if you can be claimed by Italy or can claim Italian citizenship.

[DiogenesLamp]

When your great grandfather naturalized, it bestowed what is called "derivative" citizenship on all of his children. (if they were minors at the time.) Your Grandfather became a US citizen at the same time your Grandfather did. Your Grandfather was naturalized, or if born here, had 14th amendment citizenship. All his children are natural born.