| Millennium: | 1st millennium BC |
| Centuries: | 2nd century BC – 1st century BC – 1st century |
| Decades: | 70s BC 60s BC 50s BC – 40s BC – 30s BC 20s BC 10s BC |
| Years: | 49 BC 48 BC 47 BC 46 BC 45 BC 44 BC 43 BC 42 BC 41 BC 40 BC |
| Categories: | Births – Deaths – Architecture Establishments – Disestablishments |
40s BC is a decade in the 1st century BC.
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