| Millennium: | 2nd millennium |
| Centuries: | 10th century – 11th century – 12th century |
| Decades: | 1010s 1020s 1030s – 1040s – 1050s 1060s 1070s |
| Years: | 1040 1041 1042 1043 1044 1045 1046 1047 1048 1049 |
| Categories: | Births – Deaths – Architecture Establishments – Disestablishments |
The 1040s decade ran from January 1, 1040, to December 31, 1049.