| Bob MacDonald | |
| Position: | Pitcher |
| Bats: | Left |
| Throws: | Left |
| Birth Date: | 27 April 1965 |
| Birth Place: | East Orange, New Jersey, U.S. |
| Debutleague: | MLB |
| Debutdate: | August 14 |
| Debutyear: | 1990 |
| Debutteam: | Toronto Blue Jays |
| Debut2league: | NPB |
| Debut2year: | 1997 |
| Debut2team: | Hanshin Tigers |
| Finalleague: | MLB |
| Finaldate: | June 7 |
| Finalyear: | 1996 |
| Finalteam: | New York Mets |
| Final2league: | NPB |
| Final2year: | 1997 |
| Final2team: | Hanshin Tigers |
| Stat1label: | Win–loss record |
| Stat1value: | 8–9 |
| Stat2label: | Earned run average |
| Stat2value: | 4.34 |
| Stat3label: | Strikeouts |
| Stat3value: | 142 |
| Teams: |
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Robert Joseph MacDonald (born April 27, 1965) is an American former professional baseball pitcher. He played in Major League Baseball (MLB) for the Toronto Blue Jays, Detroit Tigers, New York Yankees, and New York Mets. MacDonald also played in Nippon Professional Baseball (NPB) for the Hanshin Tigers.
MacDonald went to college at Rutgers University, and was drafted by the Blue Jays in the 19th round of the 1987 amateur draft. MacDonald played his first American professional season with their Rookie league Medicine Hat Blue Jays, Class A (Short Season) St. Catharines Blue Jays, and Class A Myrtle Beach Blue Jays in, and his last with the Mets and their Triple-A Norfolk Tides in . In 1997, he played in Japan for the Hanshin Tigers.
MacDonald manages a semi-pro slow pitch softball team in Clearwater, Florida.