John Heydler | |
|---|---|
 Heydler in 1918 | |
| Born | July 10, 1869 La Fargeville, New York, U.S. |
| Died | April 18, 1956 (aged 86) San Diego, California, U.S. |
| Nationality | American |
| Occupation(s) | National League president, umpire, sportswriter |
John Arnold Heydler (July 10, 1869 – April 18, 1956) was an American executive in Major League Baseball. After working as a National League (NL) umpire, he was the secretary to the NL president and then became the secretary-treasurer of the NL before assuming the NL presidency himself. Heydler made early contributions to baseball recordkeeping and statistics.