| Millennium: | 1st millennium |
|---|---|
| Centuries: | 8th century – 9th century – 10th century |
| Decades: | 790s 800s 810s – 820s – 830s 840s 850s |
| Years: | 822 823 824 – 825 – 826 827 828 |
| 825 by topic | |
| Politics | |
| State leaders – Sovereign states | |
| Birth and death categories | |
| Births – Deaths | |
| Establishment and disestablishment categories | |
| Establishments – Disestablishments | |
| Gregorian calendar | 825 DCCCXXV |
| Ab urbe condita | 1578 |
| Armenian calendar | 274 ԹՎ ՄՀԴ |
| Assyrian calendar | 5575 |
| Bahá'í calendar | -1019–-1018 |
| Bengali calendar | 232 |
| Berber calendar | 1775 |
| English Regnal year | N/A |
| Buddhist calendar | 1369 |
| Burmese calendar | 187 |
| Byzantine calendar | 6333–6334 |
| Chinese calendar | 甲辰年十二月初九日 (3461/3521-12-9) — to —
乙巳年十一月十八日(3462/3522-11-18) |
| Coptic calendar | 541–542 |
| Ethiopian calendar | 817–818 |
| Hebrew calendar | 4585–4586 |
| Hindu calendars | |
| - Vikram Samvat | 881–882 |
| - Shaka Samvat | 747–748 |
| - Kali Yuga | 3926–3927 |
| Holocene calendar | 10825 |
| Iranian calendar | 203–204 |
| Islamic calendar | 209–210 |
| Japanese calendar | |
| Korean calendar | 3158 |
| Minguo calendar | 1087 before ROC 民前1087年 |
| Thai solar calendar | 1368 |
Year 825 (DCCCXXV) was a common year starting on Sunday (link will display the full calendar) of the Julian calendar.