| Billy Arnold | |
| Position: | Outfielder |
| Bats: | Unknown |
| Throws: | Unknown |
| Birth Date: | March 2, 1851 |
| Birth Place: | Middletown, Connecticut, U.S. |
| Death Place: | Albany, New York, U.S. |
| Debutleague: | MLB |
| Debutdate: | April 26 |
| Debutyear: | 1872 |
| Debutteam: | Middletown Mansfields |
| Finalleague: | MLB |
| Finaldate: | May 2 |
| Finalyear: | 1872 |
| Finalteam: | Middletown Mansfields |
| Statleague: | MLB |
| Stat1label: | Games played |
| Stat1value: | 2 |
| Stat2label: | Batting average |
| Stat2value: | .143 |
| Stat3label: | Hits |
| Stat3value: | 1 |
| Teams: | |
Willis S. Arnold (March 2, 1851 – January 17, 1899) was an American professional baseball player[1] who played as an outfielder in two games of the 1872 season for the Middletown Mansfields in the National Association.
He later served as president of the New York State League and managed the Albany Senators for part of the 1885 season.