| Jim Byrnes | |
| Position: | Catcher |
| Birth Date: | 5 January 1880 |
| Birth Place: | San Francisco, California |
| Death Place: | San Francisco, California |
| Bats: | Right |
| Throws: | Right |
| Debutleague: | MLB |
| Debutdate: | April 19 |
| Debutyear: | 1906 |
| Debutteam: | Philadelphia Athletics |
| Finalleague: | MLB |
| Finaldate: | October 3 |
| Finalyear: | 1906 |
| Finalteam: | Philadelphia Athletics |
| Statleague: | MLB |
| Stat1label: | At bats |
| Stat1value: | 23 |
| Stat2label: | RBI |
| Stat2value: | 0 |
| Stat3label: | Home runs |
| Stat3value: | 0 |
| Stat4label: | Batting average |
| Stat4value: | .174 |
| Teams: |
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James Joseph Byrnes (January 5, 1880 – July 31, 1941) was an American Major League Baseball catcher. He played for the Philadelphia Athletics during the season.