Gregory Bernard Johnston (born February 12, 1955) is a former Major League Baseball outfielder. Johnston played with the San Francisco Giants in 1979 and for the Minnesota Twins from 1980 to 1981.
Greg Johnston
| Given name: | Gregory Bernard Johnston |
| Nicknames: | None |
| Primary Pos: | Centerfield |
| Hght/Wght: | 6'0" / 175 lbs |
| Bats/Throws: | L / L |
| Born: | Feb 12, 1955 in Los Angeles, CA |
| Age: | 70 |
| Debut: | Jul 27, 1979 |