|Centuries:||2nd century – 3rd century – 4th century|
|Decades:||220s 230s 240s – 250s – 260s 270s 280s|
|Years:||255 256 257 – 258 – 259 260 261|
|258 by topic|
|State leaders – Sovereign states|
|Birth and death categories|
|Births – Deaths|
|Establishment and disestablishment categories|
|Establishments – Disestablishments|
|Ab urbe condita||1011|
|Chinese calendar||丁丑年 (Fire Ox)
2954 or 2894
— to —
戊寅年 (Earth Tiger)
2955 or 2895
|Coptic calendar||−26 – −25|
|- Vikram Samvat||314–315|
|- Shaka Samvat||180–181|
|- Kali Yuga||3359–3360|
|Iranian calendar||364 BP – 363 BP|
|Islamic calendar||375 BH – 374 BH|
|Minguo calendar||1654 before ROC
|Seleucid era||569/570 AG|
|Thai solar calendar||800–801|
|Wikimedia Commons has media related to 258.|
Year 258 (CCLVIII) 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 Tuscus and Bassus (or, less frequently, year 1011 Ab urbe condita). The denomination 258 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.
- The Goths ravage Asia Minor and Trabzon.
- Gaul, Britain and Spain break off from the Roman Empire to form the Gallic Empire.
- The amount of silver in the Roman currency, of the denarius falls below 10%. The crisis ruins craftsmen, tradesmen and small farmers. They are forced to bartering, landowners grow larger by buying up cheap land.
- Valerian II, eldest son of Gallienus dies. He is possibly murdered by Pannonia's governor Ingenuus, emperor Valerian names another of Gallienus's sons, Saloninus with the title of Caesar.
- A second Imperial edict prohibits Christianity in the Roman Empire. This edict divides Christians into four categories: priests, who are to be put to death; senators and equestrians, who are to be stripped of their positions and their property confiscated; nuns, who are to be exiled; and imperial civil servants, who are condemned to forced labour.
- Emperor Hui of Jin China (approximate date)
- August 6 – Pope Sixtus II
- August 10 – Saint Lawrence
- September 14 – Cyprian, early Christian writer
- Novatian, antipope
- Sun Chen, regent of the Kingdom of Wu
- Valerian II, son of co-emperor Gallienus
- Zhuge Dan, relative and cousin of Zhuge Liang who rebelled against the Wei Kingdom