Sheets of Mongolia, 1980
| Issuer | Date | Desc | State | ||
| - |  |
Mongolia | 1/20/1980 | Winter Olympics 1980, sheet of 1 type | all added |
| - |  |
Mongolia | 5/5/1980 | sheet of 1 type | incomplete |
| - |  |
Mongolia | 6/2/1980 | Olympics 1980, sheet of 1 type | incomplete |
| - |  |
Mongolia | 8/4/1980 | World Aerobatic Championship, sheet of 1 type | all added |
| - |  |
Mongolia | 9/15/1980 | empty sheet (#16832) | incomplete |
| - |  |
Mongolia | 10/10/1980 | "Intercosmos" Space Programme - Cosmonauts, sheet of 10 types | all added |
| - |  |
Mongolia | 11/20/1980 | Classic Cars, sheet of 1 type | all added |
| - |  |
Mongolia | 12/1/1980 | Antarctic Exploration, sheet of 1 type | all added |
| - |  |
Mongolia | 12/10/1980 | 350th Anniversary of death of Johannes Kepler, sheet of 1 type | all added |
| - |  |
Mongolia | 12/20/1980 | Painting by Gombosuren, sheet of 2 types | all added |
| - |  |
Mongolia | 12/29/1980 | IYC, empty sheet (#16838) | incomplete |