- Son of Bart Giamatti, late president of Yale University, major league baseball commissioner and nemesis of Pete Rose.
- In his senior year at Yale University he was elected to the Skull and Bones secret society.
- Has one child, a boy named Samuel, born in 2001, with his wife, Elizabeth Giamatti.
- Russell Crowe stated in an interview that working with Giamatti in Cinderella Man (2005) was one of his favorite experiences in show business.
- Graduated from Yale University with a degree in English.
- In the 1998 remake of Doctor Dolittle (1998), he played a human in charge of a talking orangutan, in the 2001 remake of Planet of the Apes (2001), he played a talking orangutan in charge of humans.
- Graduated from the Yale University School of Drama with a master's degree in drama.
- Despite his portrayal of the character Miles in Sideways (2004) and Miles' passion for Pinot Noir, Giamatti himself admits that he has very little knowledge of wines and is not much of a fan of them.
- Is a big fan of science-fiction.
- In Sideways (2004) his character, Miles, looks at a picture of himself as a younger man standing with a man in sunglasses. This is a photo of him with his father, (Bart Giamatti).
- His father, Bart Giamatti died in 1989, while still in office as Commissioner of Major League Baseball.
- The Brooklyn Academy of Music asked him, its "2007 BAM Cinema Club Chair", to pick films for an eight-movie series called "Paul Giamatti Selects" and shown at the Academy in August and September 2007. His selections indicated a taste for paranoia and "the darkest of dark comedy", according to a writer for "The New York Times". Giamatti chose: Frenzy (1972), Dr. Strangelove or: How I Learned to Stop Worrying and Love the Bomb (1964), Brewster McCloud (1970), The Big Clock (1948), The Seventh Victim (1943), Dawn of the Dead (1978), Seconds (1966), and Invasion of the Body Snatchers (1978).
- His paternal grandfather, Valentine John Giamatti, was born in New Haven, CT, to Italian parents, from Campania. His paternal grandmother, Mary Claybaugh (Walton), was born in Wakefield, MA, and was of largely English descent, with deep Colonial American roots in Massachusetts and Maine. Paul's mother's ancestry included German, English, Dutch, Irish, and distant Scottish and French.
- During the shooting of The Hawk Is Dying (2006), which is mainly about his character and a Red-Tailed Hawk, he became a raptor (birds of prey) enthusiast.
- He has twice portrayed an actual President of the US: in John Adams (2008), the second President , and as Theodore Roosevelt (voice), the 26th President, in The Roosevelts: An Intimate History (2014).
- His life ambition was to star in a crime caper with Robert Duvall and John Hurt (who died in 2017). He planned on contacting the two stars with his idea should Sideways (2004) have won Best Picture at the Academy Awards.
- He has appeared in four films that have been nominated for the Best Picture Oscar: Saving Private Ryan (1998), Sideways (2004), 12 Years a Slave (2013) and The Holdovers (2023). 12 Years a Slave won in the category.
- Often plays roles based on real people--Private Parts (1997), Winchell (1998), Man on the Moon (1999), American Splendor (2003), Cinderella Man (2005), John Adams (2008), Too Big to Fail (2011) and Parkland (2013).
- He and wife Elizabeth Giamatti own a home in Venice, CA.
- Is a Boston Red Sox fan.
- Lived in Seattle, WA, for a brief period after college.
- Graduated from Choate Rosemary Hall.
- Younger brother of Marcus Giamatti.
- Is a lifelong Democrat.
- Listed as a potential nominee on both the 2003 and 2007 Razzie Award nominating ballots. He was listed as a suggestion in the Worst Supporting Actor category on the 2003 ballot for his performance in Big Fat Liar (2002) and in the Worst (Leading) Actor category for his performance in Lady in the Water (2006). He failed to receive either nomination.
- Was named in 'Weird Al' Yankovic's song "Lame Claim to Fame". "I don't mean to brag but Paul Giamatti's plumber knows me by name.".
- Has starred in three films (Private Parts (1997), American Splendor (2003) and Man on the Moon (1999) that feature characters who appear on Late Show with David Letterman (1993) and a fourth, Storytelling (2001), that starred Conan O'Brien, who hosted "Late Night" after Letterman moved to his own show on CBS.
- Ex-brother-in-law of Kathryn Meisle.
- He has appeared in two films that have been selected for the National Film Registry by the Library of Congress as being "culturally, historically or aesthetically" significant: Saving Private Ryan (1998) and 12 Years a Slave (2013).
- Graduated from Choate Rosemary Hall in 1985.
- Mentioned in 80's Guy (2021).
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