2003 CE
- Common Era
- 2003 CE
- Gregorian Calendar
- 2003 AD
- Holocene Calendar
- 12003 HE
- Japanese Calendar
- Heisei 15 (平成15年)
- Japanese Imperial Year
- Kōki 2663 (皇紀2663年)
- Chinese Sexagenary Cycle
- Yin Water Sheep (癸未)
Milestones
- First human in space
- 42 years ago
- World War II ends
- 58 years ago
- Hindu-Arabic numerals introduced to Europe
- 801 years ago
- Mythical founding of Japan
- 2662 years ago
- Foundation of Rome
- 2755 years ago
- Beginning of Xia Dynasty in China
- 4103 years ago
- First Egyptian pyramid completed
- 4613 years ago
- End of the Paleolithic Period
- 12002 years ago