| Greybull High School | |
| Type: | Public high school |
| Address: | 600 North 6th Street |
| City: | Greybull |
| State: | Wyoming |
| Zipcode: | 82426 |
| Country: | United States |
| District: | Big Horn County School District #3 |
| Grades: | 9-12 |
| Mascot: | Buffalo |
| Colors: | Blue and gold [1] |
| Enrollment: | 152 (2018–19)[2] |
| Ratio: | 9.17 |
| Staff: | 16.58 (FTE) |
Greybull High School is a public high school in Greybull, Wyoming, United States. It is part of Big Horn County School District #3 and serves students in grades 9–12. The school's mascot is the Buffalos, or "Buffs."