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Year 437 (CDXXXVII) was a common year starting on Friday (link will display the full calendar) of the Julian calendar. At the time, it was known as the Year of the Consulship of Aetius and Sigisvultus (or, less frequently, year 1190 Ab urbe condita). The denomination 437 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.
|Ab urbe condita||1190|
|Balinese saka calendar||358–359|
|Chinese calendar||丙子年 (Fire Rat)|
3133 or 3073
— to —
丁丑年 (Fire Ox)
3134 or 3074
|- Vikram Samvat||493–494|
|- Shaka Samvat||358–359|
|- Kali Yuga||3537–3538|
|Iranian calendar||185 BP – 184 BP|
|Islamic calendar||191 BH – 190 BH|
|Minguo calendar||1475 before ROC|
|Seleucid era||748/749 AG|
|Thai solar calendar||979–980|
563 or 182 or −590
— to —
564 or 183 or −589
- Flavius Aetius, Roman general (magister militum), secures the besieged city of Narbonne (Southern Gaul) against King Theodoric I. He concludes a peace treaty with the Visigoths, and becomes consul for the second time.
- July 2 – Valentinian III, age 18, rules as emperor over the Western Roman Empire. His mother Galla Placidia ends her regency, but continues to exercise political influence until her death in 450.
- October 29 – Valentinian III cements an alliance with the eastern emperor, Theodosius II, by marrying his daughter Licinia Eudoxia in Constantinople. This marks the reunion of the two branches of the House of Theodosius.
- Battle of Wallop: Ambrosius Aurelianus, leader of the Romano-British, defeats the Anglo Saxons under King Vortigern. He is given all the kingdoms of the western side of Britain (according to Historia Brittonum).
- K'inich Yax K'uk' Mo' dies after an 11-year reign. He is the founder and first ruler of the pre-Columbian Maya civilization centered at Copán (modern Honduras).
- A synod at Constantinople attempts to impinge on the Pope's rights in Illyria. Proclus tries to implement the synod's decisions, and Pope Sixtus III reminds the Illyrian bishops of their obligations to his vicar at Thessaloniki.