140
| Years: 136 137 138 139 - 140 - 141 142 143 144 | |
| Decades: 110s 120s 130s - 140s - 150s 160s 170s | |
| Centuries: 1st century - 2nd century - 3rd century 140 (number) | |
Events
- Pope Pius I succeeded Pope Hyginus.
- Ptolemy completes his Almagest (approximate date).