100–109
| Millennium: | 1st millennium |
| Centuries: | 1st century – 2nd century – 3rd century |
| Decades: | 70s 80s 90s – 100s – 110s 120s 130s |
| Years: | 100 101 102 103 104 105 106 107 108 109 |
| Categories: | Births – Deaths – Architecture Establishments – Disestablishments |
The 100s decade ran from January 1, 100 to December 31, 109. It was the first decade of the 2nd century of the Anno Domini/Common Era, according to the Julian calendar.
Eastern Hemisphere at the beginning of the 2nd century AD.