| Marty Simpson | |
| Position: | Second Baseman |
| Bats: | Unknown |
| Throws: | Unknown |
| Debutleague: | MLB |
| Debutdate: | May 14 |
| Debutyear: | 1873 |
| Debutteam: | Baltimore Marylands |
| Finalleague: | MLB |
| Finaldate: | July 11 |
| Finalyear: | 1873 |
| Finalteam: | Baltimore Marylands |
| Statleague: | MLB |
| Stat1label: | At bats |
| Stat1value: | 15 |
| Stat2label: | RBIs |
| Stat2value: | 2 |
| Stat3label: | Home runs |
| Stat3value: | 0 |
| Stat4label: | Batting average |
| Stat4value: | .133 |
Martin Simpson was an American professional baseball player, who played in four games during the season for the Baltimore Marylands.