Back 1255 Abkhazian 1255 Afrikaans 1255 ALS 1255 እ.ኤ.አ. Amharic 1255 AN 1255 Arabic 1255 ARZ 1255 AST 1255 AVK 1255 Azerbaijani
| Millennium: | 2nd millennium |
|---|---|
| Centuries: | 12th century – 13th century – 14th century |
| Decades: | 1220s 1230s 1240s – 1250s – 1260s 1270s 1280s |
| Years: | 1252 1253 1254 – 1255 – 1256 1257 1258 |
| Gregorian calendar | 1255 MCCLV |
| Ab urbe condita | 2008 |
| Armenian calendar | 704 ԹՎ ՉԴ |
| Assyrian calendar | 6005 |
| Balinese saka calendar | 1176–1177 |
| Bengali calendar | 662 |
| Berber calendar | 2205 |
| English Regnal year | 39 Hen. 3 – 40 Hen. 3 |
| Buddhist calendar | 1799 |
| Burmese calendar | 617 |
| Byzantine calendar | 6763–6764 |
| Chinese calendar | 甲寅年 (Wood Tiger) 3951 or 3891 — to — 乙卯年 (Wood Rabbit) 3952 or 3892 |
| Coptic calendar | 971–972 |
| Discordian calendar | 2421 |
| Ethiopian calendar | 1247–1248 |
| Hebrew calendar | 5015–5016 |
| Hindu calendars | |
| - Vikram Samvat | 1311–1312 |
| - Shaka Samvat | 1176–1177 |
| - Kali Yuga | 4355–4356 |
| Holocene calendar | 11255 |
| Igbo calendar | 255–256 |
| Iranian calendar | 633–634 |
| Islamic calendar | 652–653 |
| Japanese calendar | Kenchō 7 (建長７年) |
| Javanese calendar | 1164–1165 |
| Julian calendar | 1255 MCCLV |
| Korean calendar | 3588 |
| Minguo calendar | 657 before ROC 民前657年 |
| Nanakshahi calendar | −213 |
| Thai solar calendar | 1797–1798 |
| Tibetan calendar | 阳木虎年 (male Wood-Tiger) 1381 or 1000 or 228 — to — 阴木兔年 (female Wood-Rabbit) 1382 or 1001 or 229 |
1255 (MCCLV) was a common year starting on Friday of the Julian calendar, the 1255th year of the Common Era (CE) and Anno Domini (AD) designations, the 255th year of the 2nd millennium, the 55th year of the 13th century, and the 6th year of the 1250s decade. As of the start of 1255, the Gregorian calendar was 7 days ahead of the Julian calendar, which was the dominant calendar of the time.