| Jocko Halligan | |
| Position: | Outfielder |
| Bats: | Left |
| Throws: | Unknown |
| Birth Date: | December 8, 1868 |
| Birth Place: | Avon, New York, U.S. |
| Death Place: | Buffalo, New York, U.S. |
| Debutleague: | MLB |
| Debutdate: | May 13 |
| Debutyear: | 1890 |
| Debutteam: | Buffalo Bisons |
| Finalleague: | MLB |
| Finaldate: | August 3 |
| Finalyear: | 1892 |
| Finalteam: | Baltimore Orioles |
| Statleague: | MLB |
| Stat1label: | Batting average |
| Stat1value: | .281 |
| Stat2label: | At bats |
| Stat2value: | 737 |
| Stat3label: | Home Runs |
| Stat3value: | 10 |
| Teams: |
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William E. "Jocko" Halligan (December 8, 1868 – February 13, 1945) was an American professional baseball player who played outfielder in the Major Leagues from 1890 to 1892. He would play for the Baltimore Orioles, Cincinnati Reds, and Buffalo Bisons.