| Millennium: | 3rd millennium |
| Centuries: | 21st century – 22nd century – 23rd century |
| Decades: | 2090s 2100s 2110s – 2120s – 2130s 2140s 2150s |
| Years: | 2120 2121 2122 2123 2124 2125 2126 2127 2128 2129 |
The 2120s decade will begin on January 1, 2120 and will end on December 31, 2129. It will be the third decade of the 22nd century.
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