Patrick MacLeamy, FAIA, LEED AP, (born October 2, 1942, in Alton, Illinois) is an American architect who is chairman of buildingSMART International. Previously, he served as Chairman and CEO of HOK, a global architecture, engineering and planning firm. MacLeamy is the author of the book Designing a World-Class Architecture Firm: The People, Stories and Strategies Behind HOK, published by Wiley in April 2020. The book tells the history of HOK, one of the largest design firms in the world, and draws lessons from it intended to help other architects and creative services professionals improve their own practices.