Robert S Pirie (8 May 1934 – 15 January 2015) was an American lawyer. Pirie was born in Chicago. He attended Buckley School in New York City and Hotchkiss School in Connecticut. He graduated from Harvard College and Harvard Law School. As an undergraduate he was attracted to bibliographical work in Elizabethan authors and began to collect actively in the late 1950s while a lieutenant in the United States Army stationed in Germany. Pirie's extensive collection of rare books and manuscripts was auctioned by Sotheby's on December 2–4, 2015.