| Greg Thayer | |
| Position: | Pitcher |
| Bats: | Right |
| Throws: | Right |
| Birth Date: | 23 October 1949 |
| Birth Place: | Cedar Rapids, Iowa |
| Debutleague: | MLB |
| Debutdate: | April 7 |
| Debutyear: | 1978 |
| Debutteam: | Minnesota Twins |
| Finalleague: | MLB |
| Finaldate: | June 26 |
| Finalyear: | 1978 |
| Finalteam: | Minnesota Twins |
| Statleague: | MLB |
| Stat1label: | Win–loss record |
| Stat1value: | 1–1 |
| Stat2label: | Earned run average |
| Stat2value: | 3.80 |
| Stat3label: | Strikeouts |
| Stat3value: | 30 |
| Teams: | |
Gregory Allen Thayer (born October 23, 1949) is a former pitcher in Major League Baseball. He played for the Minnesota Twins in 1978.[1]