| Millennium: | 1st millennium BC |
| Centuries: | 2nd century BC – 1st century BC – 1st century |
| Decades: | 50s BC 40s BC 30s BC – 20s BC – 10s BC 0s BC 0s |
| Years: | 29 BC 28 BC 27 BC 26 BC 25 BC 24 BC 23 BC 22 BC 21 BC 20 BC |
| Categories: | Births – Deaths – Architecture Establishments – Disestablishments |
20s BC is a decade in the 1st century BC.
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