| Millennium: | 1st millennium |
|---|---|
| Centuries: | 7th century – 8th century – 9th century |
| Decades: | 700s 710s 720s – 730s – 740s 750s 760s |
| Years: | 728 729 730 – 731 – 732 733 734 |
| 731 by topic | |
| Politics | |
| State leaders – Sovereign states | |
| Birth and death categories | |
| Births – Deaths | |
| Establishment and disestablishment categories | |
| Establishments – Disestablishments | |
| Gregorian calendar | 731 DCCXXXI |
| Ab urbe condita | 1484 |
| Armenian calendar | 180 ԹՎ ՃՁ |
| Assyrian calendar | 5481 |
| Bahá'í calendar | -1113–-1112 |
| Bengali calendar | 138 |
| Berber calendar | 1681 |
| English Regnal year | N/A |
| Buddhist calendar | 1275 |
| Burmese calendar | 93 |
| Byzantine calendar | 6239–6240 |
| Chinese calendar | 庚午年十一月十九日 (3367/3427-11-19) — to —
辛未年十一月廿八日(3368/3428-11-28) |
| Coptic calendar | 447–448 |
| Ethiopian calendar | 723–724 |
| Hebrew calendar | 4491–4492 |
| Hindu calendars | |
| - Vikram Samvat | 787–788 |
| - Shaka Samvat | 653–654 |
| - Kali Yuga | 3832–3833 |
| Holocene calendar | 10731 |
| Iranian calendar | 109–110 |
| Islamic calendar | 112–113 |
| Japanese calendar | |
| Korean calendar | 3064 |
| Minguo calendar | 1181 before ROC 民前1181年 |
| Thai solar calendar | 1274 |
Year 731 (DCCXXXI) was a common year starting on Monday (link will display the full calendar) of the Julian calendar. The denomination 731 for this year has been used since the early medieval period, when the Anno Domini calendar era became the prevalent method in Europe for naming years.