1204
| Years | 
|---|
| Millennium | 
| 2nd millennium | 
| Centuries | 
| Decades | 
| Years | 
| 1204 by topic | 
|---|
| Leaders | 
| 
 | 
| Birth and death categories | 
| Births – Deaths | 
| Establishments and disestablishments categories | 
| Establishments – Disestablishments | 
| Art and literature | 
| 1204 in poetry | 
| Gregorian calendar | 1204 MCCIV | 
| Ab urbe condita | 1957 | 
| Armenian calendar | 653 ԹՎ ՈԾԳ | 
| Assyrian calendar | 5954 | 
| Balinese saka calendar | 1125–1126 | 
| Bengali calendar | 610–611 | 
| Berber calendar | 2154 | 
| English Regnal year | 5 Joh. 1 – 6 Joh. 1 | 
| Buddhist calendar | 1748 | 
| Burmese calendar | 566 | 
| Byzantine calendar | 6712–6713 | 
| Chinese calendar | 癸亥年 (Water Pig) 3901 or 3694 — to — 甲子年 (Wood Rat) 3902 or 3695 | 
| Coptic calendar | 920–921 | 
| Discordian calendar | 2370 | 
| Ethiopian calendar | 1196–1197 | 
| Hebrew calendar | 4964–4965 | 
| Hindu calendars | |
| - Vikram Samvat | 1260–1261 | 
| - Shaka Samvat | 1125–1126 | 
| - Kali Yuga | 4304–4305 | 
| Holocene calendar | 11204 | 
| Igbo calendar | 204–205 | 
| Iranian calendar | 582–583 | 
| Islamic calendar | 600–601 | 
| Japanese calendar | Kennin 4 / Genkyū 1 (元久元年) | 
| Javanese calendar | 1112–1113 | 
| Julian calendar | 1204 MCCIV | 
| Korean calendar | 3537 | 
| Minguo calendar | 708 before ROC 民前708年 | 
| Nanakshahi calendar | −264 | 
| Thai solar calendar | 1746–1747 | 
| Tibetan calendar | 阴水猪年 (female Water-Pig) 1330 or 949 or 177 — to — 阳木鼠年 (male Wood-Rat) 1331 or 950 or 178 | 
Year 1204 (MCCIV) was a leap year starting on Thursday of the Julian calendar.