Paul Edward Valentine Giamatti (born June 6, 1967) is an American actor, comedian and producer. He is best known for countless roles in several films, such as Marty Wolf, the main antagonist of the 2002 comedy film Big Fat Liar, Joe Gould in the 2005 film Cinderella Man, Rhino in the 2014 superhero film The Amazing Spider-Man 2, Jerry Heller in the 2015 film Straight Outta Compton, and Dr. Lawrence Hayeas in the 2015 disaster film San Andreas.

His Disney roles include playing Ralph in the 2013 biographical drama film Saving Mr. Banks, Extras Guild Researcher in the 1995 Miramax film Mighty Aphrodite, Carlo in the 1999 Touchstone Pictures film Cradle Will Rock, and Todd Woods in the 2000 Hollywood Pictures film Duets.

Outside of Disney, he is well-known for voicing Tim the Gate Guard in Robots and Chet in DreamWorks' Turbo.