| 90 by topic | |
| Politics | |
| State leaders - Sovereign states | |
| Birth and death categories | |
| Births - Deaths | |
| Establishment and disestablishment categories | |
| Establishments - Disestablishments | |
| Gregorian calendar | 90 XC |
| Ab urbe condita | 843 |
| Armenian calendar | N/A |
| Bahá'í calendar | -1754 – -1753 |
| Berber calendar | 1040 |
| Buddhist calendar | 634 |
| Burmese calendar | -548 |
| Byzantine calendar | 5598 – 5599 |
| Chinese calendar | 己丑年十一月十二日 (2726/2786-11-12) — to —
庚寅年十一月廿二日(2727/2787-11-22) |
| Coptic calendar | -194 – -193 |
| Ethiopian calendar | 82 – 83 |
| Hebrew calendar | 3850 – 3851 |
| Hindu calendars | |
| - Vikram Samvat | 145 – 146 |
| - Shaka Samvat | 12 – 13 |
| - Kali Yuga | 3191 – 3192 |
| Holocene calendar | 10090 |
| Iranian calendar | 532 BP – 531 BP |
| Islamic calendar | 548 BH – 547 BH |
| Japanese calendar | |
| Korean calendar | 2423 |
| Thai solar calendar | 633 |
Year 90 was a common year starting on Friday (link will display the full calendar) of the Julian calendar.
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