| Millennium: | 1st millennium |
| Centuries: | 8th century – 9th century – 10th century |
| Decades: | 820s 830s 840s – 850s – 860s 870s 880s |
| Years: | 850 851 852 853 854 855 856 857 858 859 |
| Categories: | Births – Deaths – Architecture Establishments – Disestablishments |
The 850s decade ran from January 1, 850 to December 31, 859.