In 1966, the Philadelphia Phillies had a winning record of 87–75. Over the course of the campaign, they held winning records against two of their biggest regional rivals, the Pittsburgh Pirates (10–8) and New York Mets (11–7), respectively. Philadelphia had the fourth-highest winning percentage in the National League (NL) that year. The Phillies were owned by R. R. M. "Bob" Carpenter, Jr., with the Phillies playing home games in Connie Mack Stadium, as they had since 1938.