Oliver James Platt (born January 12, 1960) is an American actor. He is currently starring in the Showtime original series, The Big C with Laura Linney.
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, New York Magazine restaurant critic, and a younger brother, Nicholas Platt, Jr.. His family moved back to the United States when Platt was three months old. Platt's maternal great-grandparents were equesterian Arthur Scott Burden and socialite Cynthia Roche; he is a second-cousin once removed of Diana, Princess of Wales through his great-great-grandmother Frances Work. When asked about Diana, Platt 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."
Because of his father's career as an ambassador, much of Platt's childhood was spent in Asia, the Middle East, and Washington, D.C. Platt attended twelve different schools, including the American School in Japan, and has said "Even now I find myself envying people who have neighborhoods and roots". Platt's family made frequent trips back to Washington, where they held Redskins season tickets. Platt is also a fan of the Boston Red Sox.