| Jess Orndorff | |
| Position: | Catcher |
| Width: | 150px |
| Bats: | Both |
| Throws: | Right |
| Birth Date: | 15 January 1881 |
| Birth Place: | Chicago |
| Death Place: | Cardiff-by-the-Sea, California |
| Debutleague: | MLB |
| Debutdate: | April 18 |
| Debutyear: | 1907 |
| Debutteam: | Boston Doves |
| Finalleague: | MLB |
| Finaldate: | April 24 |
| Finalyear: | 1907 |
| Finalteam: | Boston Doves |
| Statleague: | MLB |
| Stat1label: | Games played |
| Stat1value: | 5 |
| Stat2label: | At bats |
| Stat2value: | 17 |
| Stat3label: | Hits |
| Stat3value: | 2 |
| Teams: | |
Jesse Walworth Thayer Orndorff (January 15, 1881 – September 28, 1960) was a Major League Baseball catcher. He played for the Boston Doves in . He played parts of nine seasons in the minor leagues from 1904 to 1917.
Orndorff wrote a booklet called "The Fundamentals of How to Play Baseball" in 1936 when he was head instructor of the National Baseball School in Los Angeles.