Matthew Quincy "Matt" Daddario (born October 1, 1987) is an American actor. He is best known for his role as Alec Lightwood on the Freeform television series Shadowhunters (2016–2019). He is the brother of actress Alexandra Daddario.
Daddario was born and raised in New York City, the son of Christina, a lawyer, and Richard Daddario, a prosecutor and former head of NYPD Counterterrorism under Mayor Michael Bloomberg. His older sister is actress Alexandra Daddario; he also has a younger sister Catherine Daddario.
Daddario's paternal grandfather was Emilio Q. Daddario, a Democratic representative to the United States House of Representatives for the state of Connecticut from 1959 to 1971. He is of Slovak, Italian, Irish, Hungarian, and English ancestry. Daddario attended the Collegiate School, before attending Indiana University Bloomington, from where he graduated with a degree in economics in 2010.