Bridget Moynahan (born Kathryn Bridget Moynahan; April 28, 1971) is an American actress and model, best known for her role in the police drama Blue Bloods. She graduated from Longmeadow High School in Massachusetts in 1989, and began pursuing a career in modeling. She appeared in department-store catalogs and magazines, and after doing television commercials, she began taking acting lessons. Moynahan made her television debut in a guest appearance in the comedy series Sex and the City in 1999, where she later had a recurring role as Natasha.

She made her feature film debut in Coyote Ugly (2000). She was cast in a supporting role in Serendipity (2001). Moynahan was also featured in the action film The Sum of All Fears (2002), spy thriller The Recruit (2003), the science-fiction movie I, Robot (2004), and the political thriller Lord of War (2005).

She starred in the ABC television series Six Degrees, which premiered in September 2006, but was cancelled after one season. Moynahan completed work in Elizabeth Allen's Ramona and Beezus, which was released in July 2010, and has starred as an assistant district attorney in the CBS drama Blue Bloods since September 2010.