Singer Lady Gaga's nationality is American. She was born Stefani Joanne Angelina Germanotta on March 28, 1986 in Yonkers, N.Y. Her parents are Cynthia and Joseph Germanotta.
A person's nationality is the country to which they belong by birth or naturalization. Because she was born in the state of New York, Lady Gaga is considered an American national.
Before hitting it big as a solo artist, Lady Gaga worked as a songwriter with Interscope Records. She wrote songs for artists like Britney Spears and The Pussycat Dolls. She was discovered by R&B star Akon and shot to stardom with her debut album "The Fame."