1145
| Years | 
|---|
| Millennium | 
| 2nd millennium | 
| Centuries | 
| Decades | 
| Years | 
| 1145 by topic | 
|---|
| Leaders | 
| 
 | 
| Birth and death categories | 
| Births – Deaths | 
| Establishments and disestablishments categories | 
| Establishments – Disestablishments | 
| Art and literature | 
| 1145 in poetry | 
| Gregorian calendar | 1145 MCXLV | 
| Ab urbe condita | 1898 | 
| Armenian calendar | 594 ԹՎ ՇՂԴ | 
| Assyrian calendar | 5895 | 
| Balinese saka calendar | 1066–1067 | 
| Bengali calendar | 551–552 | 
| Berber calendar | 2095 | 
| English Regnal year | 10 Ste. 1 – 11 Ste. 1 | 
| Buddhist calendar | 1689 | 
| Burmese calendar | 507 | 
| Byzantine calendar | 6653–6654 | 
| Chinese calendar | 甲子年 (Wood Rat) 3842 or 3635 — to — 乙丑年 (Wood Ox) 3843 or 3636 | 
| Coptic calendar | 861–862 | 
| Discordian calendar | 2311 | 
| Ethiopian calendar | 1137–1138 | 
| Hebrew calendar | 4905–4906 | 
| Hindu calendars | |
| - Vikram Samvat | 1201–1202 | 
| - Shaka Samvat | 1066–1067 | 
| - Kali Yuga | 4245–4246 | 
| Holocene calendar | 11145 | 
| Igbo calendar | 145–146 | 
| Iranian calendar | 523–524 | 
| Islamic calendar | 539–540 | 
| Japanese calendar | Ten'yō 2 / Kyūan 1 (久安元年) | 
| Javanese calendar | 1051–1052 | 
| Julian calendar | 1145 MCXLV | 
| Korean calendar | 3478 | 
| Minguo calendar | 767 before ROC 民前767年 | 
| Nanakshahi calendar | −323 | 
| Seleucid era | 1456/1457 AG | 
| Thai solar calendar | 1687–1688 | 
| Tibetan calendar | 阳木鼠年 (male Wood-Rat) 1271 or 890 or 118 — to — 阴木牛年 (female Wood-Ox) 1272 or 891 or 119 | 
Year 1145 (MCXLV) was a common year starting on Monday of the Julian calendar.