401
| 401 in altris calendaris | |
| Calendari gregorian | 401 |
| Ab urbe condita | 1154 |
| Calendari armen | N/D |
| Calendari cinês | 3097 — 3098 |
| Calendari ebraic | 4160 — 4161 |
| Calendari hindu - Vikram Samvat - Shaka Samvat - Kali Yuga |
456 — 457 323 — 324 3502 — 3503 |
| Calendari iranian | -221 — -220 |
| Calendari islamic | -179 — -178 |
| Calendari runic | 651 |