John Patrick McSherry (September 11, 1944 – April 1, 1996) was an American umpire in Major League Baseball who worked in the National League from 1971 to 1996. McSherry wore uniform number 9 when he entered the National League, then wore number 10 from 1979 through the rest of his career. A respected arbiter, he was one of several umpires who were noticeably overweight. McSherry was officially listed at 6'2" (188 cm) and 328 pounds (149 kg), but some sources placed his true weight close to 400 pounds (180 kg). His weight may have been a major factor in causing his sudden cardiac death, which occurred behind home plate during the opening game of the 1996 major league season in Cincinnati on April 1, 1996.