| Millennium: | 2nd millennium |
|---|---|
| Centuries: | 10th century – 11th century – 12th century |
| Decades: | 990s 1000s 1010s – 1020s – 1030s 1040s 1050s |
| Years: | 1017 1018 1019 – 1020 – 1021 1022 1023 |
| 1020 by topic | |
| Lists of leaders | |
| State leaders | |
| Birth and death categories | |
| Births – Deaths | |
| Establishments and disestablishments categories | |
| Establishments – Disestablishments | |
| Gregorian calendar | 1020 MXX |
| Ab urbe condita | 1773 |
| Armenian calendar | 469 ԹՎ ՆԿԹ |
| Bahá'í calendar | -824 – -823 |
| Bengali calendar | 427 |
| Berber calendar | 1970 |
| Buddhist calendar | 1564 |
| Burmese calendar | 382 |
| Byzantine calendar | 6528 – 6529 |
| Chinese calendar | 己未年十二月初四日 (3656/3716-12-4) — to —
庚申年十二月十五日(3657/3717-12-15) |
| Coptic calendar | 736 – 737 |
| Ethiopian calendar | 1012 – 1013 |
| Hebrew calendar | 4780 – 4781 |
| Hindu calendars | |
| - Bikram Samwat | 1076 – 1077 |
| - Shaka Samvat | 942 – 943 |
| - Kali Yuga | 4121 – 4122 |
| Holocene calendar | 11020 |
| Iranian calendar | 398 – 399 |
| Islamic calendar | 410 – 411 |
| Japanese calendar | |
| Korean calendar | 3353 |
| Thai solar calendar | 1563 |