| William Rexter | |
| Position: | Outfielder |
| Birth Date: | c. 1850 |
| Birth Place: | Brooklyn, New York |
| Death Place: | Staten Island, New York |
| Bats: | Unknown |
| Throws: | Unknown |
| Debutleague: | MLB |
| Debutdate: | September 25 |
| Debutyear: | 1875 |
| Debutteam: | Brooklyn Atlantics |
| Finalleague: | MLB |
| Finaldate: | September 25 |
| Finalyear: | 1875 |
| Finalteam: | Brooklyn Atlantics |
| Statleague: | MLB |
| Stat1label: | At bats |
| Stat1value: | 4 |
| Stat2label: | Batting average |
| Stat2value: | .000 |
| Stat3label: | RBI |
| Stat3value: | 0 |
| Teams: | |
William H. Rexter (c. 1850 – June 23, 1898) was an American professional baseball player who played outfield for the 1875 Brooklyn Atlantics.