| Millennium: | 1st millennium |
|---|---|
| Centuries: | 2nd century – 3rd century – 4th century |
| Decades: | 170s 180s 190s – 200s – 210s 220s 230s |
| Years: | 201 202 203 – 204 – 205 206 207 |
| 204 by topic | |
| Politics | |
| State leaders – Sovereign states | |
| Birth and death categories | |
| Births – Deaths | |
| Establishment and disestablishment categories | |
| Establishments – Disestablishments | |
| Gregorian calendar | 204 CCIV |
| Ab urbe condita | 957 |
| Armenian calendar | N/A |
| Assyrian calendar | 4954 |
| Bahá'í calendar | -1640–-1639 |
| Bengali calendar | -389 |
| Berber calendar | 1154 |
| English Regnal year | N/A |
| Buddhist calendar | 748 |
| Burmese calendar | -434 |
| Byzantine calendar | 5712–5713 |
| Chinese calendar | 癸未年十一月十二日 (2840/2900-11-12) — to —
甲申年十一月廿二日(2841/2901-11-22) |
| Coptic calendar | -80–-79 |
| Ethiopian calendar | 196–197 |
| Hebrew calendar | 3964–3965 |
| Hindu calendars | |
| - Vikram Samvat | 260–261 |
| - Shaka Samvat | 126–127 |
| - Kali Yuga | 3305–3306 |
| Holocene calendar | 10204 |
| Iranian calendar | 418 BP – 417 BP |
| Islamic calendar | 431 BH – 430 BH |
| Japanese calendar | |
| Korean calendar | 2537 |
| Minguo calendar | 1708 before ROC 民前1708年 |
| Thai solar calendar | 747 |
Year 204 (CCIV) was a leap year starting on Sunday (link will display the full calendar) of the Julian calendar. At the time, it was known as the Year of the Consulship of Cilo and Flavius (or, less frequently, year 957 Ab urbe condita). The denomination 204 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.