Gregory Allen Thayer (born October 23, 1949) is a former pitcher in Major League Baseball. He played for the Minnesota Twins in 1978.
Greg Thayer
| Given name: | Gregory Allen Thayer |
| Nicknames: | None |
| Primary Pos: | Pitcher |
| Hght/Wght: | 5'11" / 182 lbs |
| Bats/Throws: | R / R |
| Born: | Oct 23, 1949 in Cedar Rapids, IA |
| Age: | 75 |
| Debut: | Apr 7, 1978 |