William Deck McGuire (born June 23, 1989) is an American professional baseball pitcher who is a free agent. He played college baseball for the Georgia Tech Yellow Jackets, and was named the Atlantic Coast Conference Baseball Pitcher of the Year in 2009. He previously played in Major League Baseball (MLB) for the Cincinnati Reds, Toronto Blue Jays, Los Angeles Angels, and Samsung Lions of the KBO League, and Rakuten Monkeys of the Chinese Professional Baseball League (CPBL).