Samuel Irving Newhouse, Jr. (born November 8, 1927), nicknamed Si Newhouse, is the chairman and CEO of Advance Publications, which, among other interests, owns Condé Nast, publisher of many marquee brands in the world of magazines such as Vogue, Vanity Fair, and The New Yorker. He is the son of Samuel Irving Newhouse, Sr., founder of Advance Publications. His grandson, S. I. Newhouse IV, appeared in the documentary Born Rich.
Newhouse attended the Horace Mann School in New York City. He has an estimated net worth of $6.6 billion, and he was ranked the 47th richest American by Forbes Magazine in 2011.