Nadia Alexander is an American actress.

In 2007, Alexander moved to New York City, and began doing commercial and episodic television work. While still in high school, Alexander performed off-Broadway in There Are No More Big Secrets at Rattlestick Playwrights Theater. Her first feature film performance was in the independent movie Postales. She then went on to appear in Ten Thousand Saints and Fan Girl.

In 2010, she made a guest appearance on an episode of Law & Order. Since then, she has worked on several television series, including HBO's Boardwalk Empire (2011), The Following (2015), USA Network's The Sinner (2017), and Netflix's Seven Seconds (2018).

In 2017, she played a lead role in Blame, alongside Chris Messina and Quinn Shephard. The film screened at several film festivals, and for her work, Alexander won the award for Best Actress in a U.S. Narrative Film at the 2017 Tribeca Film Festival.