1550
| Years | 
|---|
| Millennium | 
| 2nd millennium | 
| Centuries | 
| Decades | 
| Years | 
| 1550 by topic | 
|---|
| Arts and science | 
| Leaders | 
| 
 | 
| Birth and death categories | 
| Births – Deaths | 
| Establishments and disestablishments categories | 
| Establishments – Disestablishments | 
| Works category | 
| 
 | 
| Gregorian calendar | 1550 MDL | 
| Ab urbe condita | 2303 | 
| Armenian calendar | 999 ԹՎ ՋՂԹ | 
| Assyrian calendar | 6300 | 
| Balinese saka calendar | 1471–1472 | 
| Bengali calendar | 956–957 | 
| Berber calendar | 2500 | 
| English Regnal year | 3 Edw. 6 – 4 Edw. 6 | 
| Buddhist calendar | 2094 | 
| Burmese calendar | 912 | 
| Byzantine calendar | 7058–7059 | 
| Chinese calendar | 己酉年 (Earth Rooster) 4247 or 4040 — to — 庚戌年 (Metal Dog) 4248 or 4041 | 
| Coptic calendar | 1266–1267 | 
| Discordian calendar | 2716 | 
| Ethiopian calendar | 1542–1543 | 
| Hebrew calendar | 5310–5311 | 
| Hindu calendars | |
| - Vikram Samvat | 1606–1607 | 
| - Shaka Samvat | 1471–1472 | 
| - Kali Yuga | 4650–4651 | 
| Holocene calendar | 11550 | 
| Igbo calendar | 550–551 | 
| Iranian calendar | 928–929 | 
| Islamic calendar | 956–957 | 
| Japanese calendar | Tenbun 19 (天文19年) | 
| Javanese calendar | 1468–1469 | 
| Julian calendar | 1550 MDL | 
| Korean calendar | 3883 | 
| Minguo calendar | 362 before ROC 民前362年 | 
| Nanakshahi calendar | 82 | 
| Thai solar calendar | 2092–2093 | 
| Tibetan calendar | 阴土鸡年 (female Earth-Rooster) 1676 or 1295 or 523 — to — 阳金狗年 (male Iron-Dog) 1677 or 1296 or 524 | 
Year 1550 (MDL) was a common year starting on Wednesday of the Julian calendar.