1st millennium BC
| Millennia: | 2nd millennium BC · 1st millennium BC · 1st millennium AD |
| Centuries: | 10th century BC · 9th century BC · 8th century BC · 7th century BC · 6th century BC · 5th century BC · 4th century BC · 3rd century BC · 2nd century BC · 1st century BC |
The 1st millennium BC was the last millennium before the Common Era. It started on January 1, 1000 BC, and ended on December 31, 1 BC. There was a year 0 and no year 0 BC.