| Millennium: | 1st millennium |
|---|---|
| Centuries: | |
| Decades: | |
| Years: |
| 603 by topic |
|---|
| Leaders |
| Categories |
| Gregorian calendar | 603 DCIII |
| Ab urbe condita | 1356 |
| Armenian calendar | 52 ԹՎ ԾԲ |
| Assyrian calendar | 5353 |
| Balinese saka calendar | 524–525 |
| Bengali calendar | 10 |
| Berber calendar | 1553 |
| Buddhist calendar | 1147 |
| Burmese calendar | −35 |
| Byzantine calendar | 6111–6112 |
| Chinese calendar | 壬戌年 (Water Dog) 3300 or 3093 — to — 癸亥年 (Water Pig) 3301 or 3094 |
| Coptic calendar | 319–320 |
| Discordian calendar | 1769 |
| Ethiopian calendar | 595–596 |
| Hebrew calendar | 4363–4364 |
| Hindu calendars | |
| - Vikram Samvat | 659–660 |
| - Shaka Samvat | 524–525 |
| - Kali Yuga | 3703–3704 |
| Holocene calendar | 10603 |
| Iranian calendar | 19 BP – 18 BP |
| Islamic calendar | 20 BH – 19 BH |
| Japanese calendar | N/A |
| Javanese calendar | 492–493 |
| Julian calendar | 603 DCIII |
| Korean calendar | 2936 |
| Minguo calendar | 1309 before ROC 民前1309年 |
| Nanakshahi calendar | −865 |
| Seleucid era | 914/915 AG |
| Thai solar calendar | 1145–1146 |
| Tibetan calendar | 阳水狗年 (male Water-Dog) 729 or 348 or −424 — to — 阴水猪年 (female Water-Pig) 730 or 349 or −423 |
Year 603 (DCIII) was a common year starting on Tuesday (link will display the full calendar) of the Julian calendar. The denomination 603 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.