| Millennium: | 2nd millennium |
|---|---|
| Centuries: | |
| Decades: | |
| Years: |
| 1023 by topic |
|---|
| Leaders |
| Birth and death categories |
| Births – Deaths |
| Establishments and disestablishments categories |
| Establishments – Disestablishments |
| Gregorian calendar | 1023 MXXIII |
| Ab urbe condita | 1776 |
| Armenian calendar | 472 ԹՎ ՆՀԲ |
| Assyrian calendar | 5773 |
| Balinese saka calendar | 944–945 |
| Bengali calendar | 430 |
| Berber calendar | 1973 |
| English Regnal year | N/A |
| Buddhist calendar | 1567 |
| Burmese calendar | 385 |
| Byzantine calendar | 6531–6532 |
| Chinese calendar | 壬戌年 (Water Dog) 3720 or 3513 — to — 癸亥年 (Water Pig) 3721 or 3514 |
| Coptic calendar | 739–740 |
| Discordian calendar | 2189 |
| Ethiopian calendar | 1015–1016 |
| Hebrew calendar | 4783–4784 |
| Hindu calendars | |
| - Vikram Samvat | 1079–1080 |
| - Shaka Samvat | 944–945 |
| - Kali Yuga | 4123–4124 |
| Holocene calendar | 11023 |
| Igbo calendar | 23–24 |
| Iranian calendar | 401–402 |
| Islamic calendar | 413–414 |
| Japanese calendar | Jian 3 (治安３年) |
| Javanese calendar | 925–926 |
| Julian calendar | 1023 MXXIII |
| Korean calendar | 3356 |
| Minguo calendar | 889 before ROC 民前889年 |
| Nanakshahi calendar | −445 |
| Seleucid era | 1334/1335 AG |
| Thai solar calendar | 1565–1566 |
| Tibetan calendar | 阳水狗年 (male Water-Dog) 1149 or 768 or −4 — to — 阴水猪年 (female Water-Pig) 1150 or 769 or −3 |
Year 1023 (MXXIII) was a common year starting on Tuesday (link will display the full calendar) of the Julian calendar.