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|438 by topic|
|Ab urbe condita||1191|
|Balinese saka calendar||359–360|
|Chinese calendar||丁丑年 (Fire Ox)|
3134 or 3074
— to —
戊寅年 (Earth Tiger)
3135 or 3075
|- Vikram Samvat||494–495|
|- Shaka Samvat||359–360|
|- Kali Yuga||3538–3539|
|Iranian calendar||184 BP – 183 BP|
|Islamic calendar||190 BH – 189 BH|
|Minguo calendar||1474 before ROC|
|Seleucid era||749/750 AG|
|Thai solar calendar||980–981|
564 or 183 or −589
— to —
565 or 184 or −588
Year 438 (CDXXXVIII) was a common year starting on Saturday (link will display the full calendar) of the Julian calendar. At the time, it was known as the Year of the Consulship of Theodosius and Glabrio (or, less frequently, year 1191 Ab urbe condita). The denomination 438 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.
- Emperor Theodosius II forbids the divulging of secrets of naval carpentry, probably to avoid its spread to the rising Vandal power in North Africa.
- February 15 – The Codex Theodosianus, a collection of edicts of Roman law, is published.
- Aelia Eudocia, wife of Theodosius II, goes on a pilgrimage to Jerusalem, bringing back with her holy relics to prove her faith.
- The last gladiatorial fights are held in the Colosseum (Rome). Animal hunts continue until at least 523.
- King Hermeric of the Suebic Kingdom of Galicia is forced after a seven-year illness to retire. He hands the government over to his son Rechila.
- Bahram V dies after an 18-year reign. He is succeeded by his son Yazdegerd II, who becomes the fifteenth Sassanid king of the Persian Empire.