| Len Dondero | |
| Position: | Third baseman/Second baseman |
| Bats: | Right |
| Throws: | Right |
| Birth Date: | 12 September 1903 |
| Birth Place: | Newark, California |
| Death Place: | Fremont, California |
| Debutleague: | MLB |
| Debutdate: | April 12 |
| Debutteam: | St. Louis Browns |
| Finalleague: | MLB |
| Finaldate: | August 11 |
| Finalteam: | St. Louis Browns |
| Statleague: | MLB |
| Stat1label: | Batting average |
| Stat1value: | .194 |
| Stat2label: | Home runs |
| Stat2value: | 1 |
| Stat3label: | Runs batted in |
| Stat3value: | 8 |
| Teams: | |
Leonard Peter Dondero (September 12, 1903 – January 1, 1999) was a Major League Baseball third baseman and second baseman who played with the St. Louis Browns in .