| Bill Hassamaer | |
| Bats: | Unknown |
| Throws: | Unknown |
| Birth Date: | 26 July 1864 |
| Birth Place: | St. Louis, Missouri |
| Death Place: | St. Louis, Missouri |
| Debutleague: | MLB |
| Debutdate: | April 19 |
| Debutyear: | 1894 |
| Debutteam: | Washington Senators |
| Finalleague: | MLB |
| Finaldate: | July 6 |
| Finalyear: | 1896 |
| Finalteam: | Louisville Colonels |
| Statleague: | MLB |
| Stat1label: | Batting average |
| Stat1value: | .289 |
| Stat2label: | Runs batted in |
| Stat2value: | 178 |
| Stat3label: | Home Runs |
| Stat3value: | 7 |
| Teams: |
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William Louis Hassamaer (July 26, 1864 – May 25, 1910), was a former professional baseball player who played outfielder in the Major Leagues from 1894 to 1896. He played for the Louisville Colonels and Washington Senators.
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