1921
| 1921 in altris calendaris | |
| Calendari gregorian | 1921 |
| Ab urbe condita | 2674 |
| Calendari armen | 1370 |
| Calendari cinês | 4617 — 4618 |
| Calendari ebraic | 5680 — 5681 |
| Calendari hindu - Vikram Samvat - Shaka Samvat - Kali Yuga |
1976 — 1977 1843 — 1844 5022 — 5023 |
| Calendari iranian | 1299 — 1300 |
| Calendari islamic | 1341 — 1342 |
| Calendari runic | 2171 |