Louis Giambalvo (born February 8, 1945) is an American actor, frequently seen on television in guest roles.

His television credits include: Barney Miller, Hart to Hart, St. Elsewhere, Hill Street Blues, The Love Boat, Remington Steele, The A-Team, Simon & Simon, Fame, Knots Landing, Murder She Wrote, Star Trek: Voyager, Brooklyn South, Ally McBeal, ER, NYPD Blue (Mr. Bucci), Boston Legal, Without a Trace, CSI, Ugly Betty, Dirty Sexy Money and Raising the Bar. He also played Al Capone on the NBC series The Gangster Chronicles. He also was in the award-winning television movie Gia, starring Angelina Jolie, playing the role of Gia Carangi's father Joseph.

Giambalvo's feature films include "Bottle Shock", "Gun Shy", "Hoffa", and the 1983 horror/science fiction film Nightmares. He is best known for his roles in such films as Airplane II: The Sequel (1982), the 1985 comedy film Real Genius as a CIA man, Major Carnagle, and Jagged Edge (1985) as Mr. Fabrizzi. His other well known film role was in the 1988 hit action film The Dead Pool as Gus Wheeler, a deranged person who, in a tragic bid for media attention, pours gasoline on himself, and ends up lighting himself on fire.