| Millennium: | 1st millennium |
|---|---|
| Centuries: | |
| Decades: | |
| Years: |
| 623 by topic |
|---|
| Leaders |
| Categories |
| Gregorian calendar | 623 DCXXIII |
| Ab urbe condita | 1376 |
| Armenian calendar | 72 ԹՎ ՀԲ |
| Assyrian calendar | 5373 |
| Balinese saka calendar | 544–545 |
| Bengali calendar | 30 |
| Berber calendar | 1573 |
| Buddhist calendar | 1167 |
| Burmese calendar | −15 |
| Byzantine calendar | 6131–6132 |
| Chinese calendar | 壬午年 (Water Horse) 3320 or 3113 — to — 癸未年 (Water Goat) 3321 or 3114 |
| Coptic calendar | 339–340 |
| Discordian calendar | 1789 |
| Ethiopian calendar | 615–616 |
| Hebrew calendar | 4383–4384 |
| Hindu calendars | |
| - Vikram Samvat | 679–680 |
| - Shaka Samvat | 544–545 |
| - Kali Yuga | 3723–3724 |
| Holocene calendar | 10623 |
| Iranian calendar | 1–2 |
| Islamic calendar | 1–2 |
| Japanese calendar | N/A |
| Javanese calendar | 513–514 |
| Julian calendar | 623 DCXXIII |
| Korean calendar | 2956 |
| Minguo calendar | 1289 before ROC 民前1289年 |
| Nanakshahi calendar | −845 |
| Seleucid era | 934/935 AG |
| Thai solar calendar | 1165–1166 |
| Tibetan calendar | 阳水马年 (male Water-Horse) 749 or 368 or −404 — to — 阴水羊年 (female Water-Goat) 750 or 369 or −403 |
Year 623 (DCXXIII) was a common year starting on Saturday (link will display the full calendar) of the Julian calendar. The denomination 623 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.