| 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: | 31 BC 30 BC 29 BC – 28 BC – 27 BC 26 BC 25 BC |
| 28 BC by topic | |
| Politics | |
| State leaders – Sovereign states | |
| Birth and death categories | |
| Births – Deaths | |
| Establishments and disestablishments categories | |
| Establishments – Disestablishments | |
| Gregorian calendar | 28 BC |
| Ab urbe condita | 726 |
| Armenian calendar | N/A |
| Bahá'í calendar | -1871 – -1870 |
| Bengali calendar | -620 |
| Berber calendar | 923 |
| Buddhist calendar | 517 |
| Burmese calendar | -665 |
| Byzantine calendar | 5481 – 5482 |
| Chinese calendar | 壬辰年 (2609/2669) — to —
癸巳年(2610/2670) |
| Coptic calendar | -311 – -310 |
| Ethiopian calendar | -35 – -34 |
| Hebrew calendar | 3733 – 3734 |
| Hindu calendars | |
| - Bikram Samwat | 29 – 30 |
| - Shaka Samvat | N/A |
| - Kali Yuga | 3074 – 3075 |
| Holocene calendar | 9973 |
| Iranian calendar | 649 BP – 648 BP |
| Islamic calendar | 669 BH – 668 BH |
| Japanese calendar | |
| Korean calendar | 2306 |
| Thai solar calendar | 516 |
Year 28 BC was a common year starting on Saturday (link will display the full calendar) of the Julian calendar. At the time, it was known as the Year of the First Consulship of Octavian and Agrippa (or, less frequently, year 726 Ab urbe condita). The denomination 28 BC for this year has been used since the early medieval period, when the Anno Domini calendar era became the prevalent method in Europe for naming years.