Oliver James Platt (born January 12, 1960) is a Canadian-born American actor. He has been nominated for a Golden Globe Award, as well as multiple Emmy and Screen Actors Guild Awards.
Platt was born in Windsor, Ontario, Canada, to American parents Sheila Maynard, a clinical social worker who worked in Islamabad, and Nicholas Platt, a career diplomat who served as U.S. ambassador to Pakistan, Zambia, and the Philippines. He has an older brother, Adam Platt, a New York Magazine restaurant critic, and a younger brother, Nicholas Platt Jr. The family moved back to the United States when Platt was three months old.
Platt's paternal great-grandfather was artist Charles A. Platt, and his maternal great-grandparents were equestrian Arthur Scott Burden (of the industrialist Burden family) and socialite Cynthia Roche. Platt is also a great-great-grandson of diplomat and lawyer Joseph Hodges Choate (through his father) and General Robert Shaw Oliver (through his mother). He is a second cousin once removed of Diana, Princess of Wales, and of her brother Charles Spencer, 9th Earl Spencer, through his great-great-grandparents, MP James Roche and heiress Frances Ellen Work. When asked about Diana, Platt has said, "I never met her. It's a non-story. I'd love to tell you we were confidantes. The truth is I don't know much more about it than you do."