| Millennium: | 2nd millennium |
| Centuries: | 11th century – 12th century – 13th century |
| Decades: | 1090s 1100s 1110s – 1120s – 1130s 1140s 1150s |
| Years: | 1120 1121 1122 1123 1124 1125 1126 1127 1128 1129 |
| Categories: | Births – Deaths – Architecture Establishments – Disestablishments |
The 1120s decade ran from January 1, 1120, to December 31, 1129.