| Bill O'Neill | |
| Position: | Outfielder |
| Birth Date: | 22 January 1880 |
| Birth Place: | Saint John, New Brunswick |
| Death Place: | Woodhaven, New York |
| Bats: | Switch |
| Throws: | Right |
| Debutleague: | MLB |
| Debutdate: | May 7 |
| Debutyear: | 1904 |
| Debutteam: | Boston Americans |
| Finalleague: | MLB |
| Finaldate: | October 7 |
| Finalyear: | 1906 |
| Finalteam: | Chicago White Sox |
| Statleague: | MLB |
| Stat1label: | Batting average |
| Stat1value: | .243 |
| Stat2label: | Home runs |
| Stat2value: | 2 |
| Stat3label: | Runs batted in |
| Stat3value: | 42 |
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William John O'Neill (January 22, 1880 – July 20, 1920) was an outfielder in Major League Baseball who played for the Boston Americans (1904), Washington Senators (1904) and Chicago White Sox (1906). O'Neill was a switch-hitter and threw right-handed. He was born in Saint John, New Brunswick, Canada.
Playing at shortstop in his 1904 rookie season for the Red Sox, O'Neill committed six errors during a 13-inning 5–3 loss to the St Louis Browns on May 21 to become the only 20th-century Major League player to record six errors in a game.[1] In the midseason he was traded to Washington in the same transaction that brought Kip Selbach to Boston. In 1906 O'Neill was a member of the Chicago White Sox team that won the World Championship over the Chicago Cubs in six games.
In a two-season career, O'Neill was a .243 hitter with two home runs and 42 RBI in 206 games played.
O'Neill died in Woodhaven, New York, at the age of 40.