| Millennium: | 1st millennium BC |
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| 603 BC by topic |
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| Gregorian calendar | 603 BC DCIII BC |
| Ab urbe condita | 151 |
| Ancient Egypt era | XXVI dynasty, 62 |
| - Pharaoh | Necho II, 8 |
| Ancient Greek era | 44th Olympiad, year 2 |
| Assyrian calendar | 4148 |
| Balinese saka calendar | N/A |
| Bengali calendar | −1195 |
| Berber calendar | 348 |
| Buddhist calendar | −58 |
| Burmese calendar | −1240 |
| Byzantine calendar | 4906–4907 |
| Chinese calendar | 丁巳年 (Fire Snake) 2095 or 1888 — to — 戊午年 (Earth Horse) 2096 or 1889 |
| Coptic calendar | −886 – −885 |
| Discordian calendar | 564 |
| Ethiopian calendar | −610 – −609 |
| Hebrew calendar | 3158–3159 |
| Hindu calendars | |
| - Vikram Samvat | −546 – −545 |
| - Shaka Samvat | N/A |
| - Kali Yuga | 2498–2499 |
| Holocene calendar | 9398 |
| Iranian calendar | 1224 BP – 1223 BP |
| Islamic calendar | 1262 BH – 1261 BH |
| Javanese calendar | N/A |
| Julian calendar | N/A |
| Korean calendar | 1731 |
| Minguo calendar | 2514 before ROC 民前2514年 |
| Nanakshahi calendar | −2070 |
| Thai solar calendar | −60 – −59 |
| Tibetan calendar | 阴火蛇年 (female Fire-Snake) −476 or −857 or −1629 — to — 阳土马年 (male Earth-Horse) −475 or −856 or −1628 |
The year 603 BC was a year of the pre-Julian Roman calendar. In the Roman Empire, it was known as year 151 Ab urbe condita. The denomination 601 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.
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