Judd Seymore Hirsch (born March 15, 1935) is an American actor. He is known for playing Alex Rieger on the television comedy series Taxi (1978–1983), John Lacey on the NBC series Dear John (1988–1992), and Alan Eppes on the CBS series Numb3rs (2005–2010). He is also well known for his career in theatre and for his roles in films such as Ordinary People (1980), Running on Empty (1988), Independence Day (1996), A Beautiful Mind (2001), Independence Day: Resurgence (2016), Uncut Gems (2019), and The Fabelmans (2022).

He won two Primetime Emmy Awards for Outstanding Lead Actor in a Comedy Series, two Tony Awards for Best Actor in a Play, the Golden Globe Award for Best Actor – Television Series Musical or Comedy, and was nominated twice for the Academy Award for Best Supporting Actor. The 42-year gap between his first nomination (Ordinary People in 1980) and second (The Fabelmans in 2022) is the longest in history.