| Billy Parker | |
| Position: | Second baseman |
| Bats: | Right |
| Throws: | Right |
| Birth Date: | 14 January 1942 |
| Birth Place: | Hayneville, Alabama |
| Death Place: | Sun City West, Arizona |
| Debutleague: | MLB |
| Debutdate: | September 9 |
| Debutyear: | 1971 |
| Debutteam: | California Angels |
| Finalleague: | MLB |
| Finaldate: | September 29 |
| Finalyear: | 1973 |
| Finalteam: | California Angels |
| Statleague: | MLB |
| Stat1label: | Batting average |
| Stat1value: | .222 |
| Stat2label: | Home runs |
| Stat2value: | 3 |
| Stat3label: | Runs batted in |
| Stat3value: | 21 |
| Teams: | |
William David Parker (January 14, 1942 – February 9, 2003) was a professional baseball player who played parts of three seasons for the California Angels of Major League Baseball. He is the first player to hit a walk-off homer in his major league debut, doing so on September 9, 1971 for the Angels.
Parker's professional baseball career began in 1961 with the Negro league Indianapolis Clowns, where he played through 1964.[1] [2] He was selected by the New York Yankees from the Salt Lake City Angels in the Rule 5 draft on December 3, 1973.[3]