Back 321 v.C. Afrikaans 321 ق م Arabic 321 قبل لميلاد ARY 321 ق م ARZ 321 e.C. AST E.ə. 321 Azerbaijani 321 да н.э. Byelorussian 321 да н. э. BE-X-OLD 321 г. пр.н.е. Bulgarian 321. p. n. e. BS
| Millennium: | 1st millennium BC |
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| Centuries: | |
| Decades: | |
| Years: |
| 321 BC by topic |
| Politics |
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| Categories |
| Gregorian calendar | 321 BC CCCXXI BC |
| Ab urbe condita | 433 |
| Ancient Egypt era | XXXIII dynasty, 3 |
| - Pharaoh | Ptolemy I Soter, 3 |
| Ancient Greek era | 114th Olympiad, year 4 |
| Assyrian calendar | 4430 |
| Balinese saka calendar | N/A |
| Bengali calendar | −913 |
| Berber calendar | 630 |
| Buddhist calendar | 224 |
| Burmese calendar | −958 |
| Byzantine calendar | 5188–5189 |
| Chinese calendar | 己亥年 (Earth Pig) 2377 or 2170 — to — 庚子年 (Metal Rat) 2378 or 2171 |
| Coptic calendar | −604 – −603 |
| Discordian calendar | 846 |
| Ethiopian calendar | −328 – −327 |
| Hebrew calendar | 3440–3441 |
| Hindu calendars | |
| - Vikram Samvat | −264 – −263 |
| - Shaka Samvat | N/A |
| - Kali Yuga | 2780–2781 |
| Holocene calendar | 9680 |
| Iranian calendar | 942 BP – 941 BP |
| Islamic calendar | 971 BH – 970 BH |
| Javanese calendar | N/A |
| Julian calendar | N/A |
| Korean calendar | 2013 |
| Minguo calendar | 2232 before ROC 民前2232年 |
| Nanakshahi calendar | −1788 |
| Thai solar calendar | 222–223 |
| Tibetan calendar | 阴土猪年 (female Earth-Pig) −194 or −575 or −1347 — to — 阳金鼠年 (male Iron-Rat) −193 or −574 or −1346 |
Year 321 BC was a year of the pre-Julian Roman calendar. At the time, it was known as the Year of the Consulship of Calvinus and Caudinus (or, less frequently, year 433 Ab urbe condita). The denomination 321 BC 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.