Back 1803 Abkhazian 1803 Afrikaans 1803 ALS 1803 እ.ኤ.አ. Amharic 1803 AN 1803 Arabic 1803 ARY 1803 ARZ 1803 AST 1803 AVK
| Millennium: | 2nd millennium |
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| 1803 by topic |
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| Humanities |
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| Gregorian calendar | 1803 MDCCCIII |
| French Republican calendar | 11–12 |
| Ab urbe condita | 2556 |
| Armenian calendar | 1252 ԹՎ ՌՄԾԲ |
| Assyrian calendar | 6553 |
| Balinese saka calendar | 1724–1725 |
| Bengali calendar | 1210 |
| Berber calendar | 2753 |
| British Regnal year | 43 Geo. 3 – 44 Geo. 3 |
| Buddhist calendar | 2347 |
| Burmese calendar | 1165 |
| Byzantine calendar | 7311–7312 |
| Chinese calendar | 壬戌年 (Water Dog) 4500 or 4293 — to — 癸亥年 (Water Pig) 4501 or 4294 |
| Coptic calendar | 1519–1520 |
| Discordian calendar | 2969 |
| Ethiopian calendar | 1795–1796 |
| Hebrew calendar | 5563–5564 |
| Hindu calendars | |
| - Vikram Samvat | 1859–1860 |
| - Shaka Samvat | 1724–1725 |
| - Kali Yuga | 4903–4904 |
| Holocene calendar | 11803 |
| Igbo calendar | 803–804 |
| Iranian calendar | 1181–1182 |
| Islamic calendar | 1217–1218 |
| Japanese calendar | Kyōwa 2 (享和２年) |
| Javanese calendar | 1729–1730 |
| Julian calendar | Gregorian minus 12 days |
| Korean calendar | 4136 |
| Minguo calendar | 109 before ROC 民前109年 |
| Nanakshahi calendar | 335 |
| Thai solar calendar | 2345–2346 |
| Tibetan calendar | 阳水狗年 (male Water-Dog) 1929 or 1548 or 776 — to — 阴水猪年 (female Water-Pig) 1930 or 1549 or 777 |
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1803 (MDCCCIII) was a common year starting on Saturday of the Gregorian calendar and a common year starting on Thursday of the Julian calendar, the 1803rd year of the Common Era (CE) and Anno Domini (AD) designations, the 803rd year of the 2nd millennium, the 3rd year of the 19th century, and the 4th year of the 1800s decade. As of the start of 1803, the Gregorian calendar was 12 days ahead of the Julian calendar, which remained in localized use until 1923.