|Centuries:||1st century BC – 1st century – 2nd century|
|Decades:||10s 20s 30s – 40s – 50s 60s 70s|
|Years:||45 46 47 – 48 – 49 50 51|
|48 by topic|
|State leaders – Sovereign states|
|Birth and death categories|
|Births – Deaths|
|Establishment and disestablishment categories|
|Establishments – Disestablishments|
|Ab urbe condita||801|
|Chinese calendar||丁未年 (Fire Goat)
2744 or 2684
— to —
戊申年 (Earth Monkey)
2745 or 2685
|Coptic calendar||−236 – −235|
|- Vikram Samvat||104–105|
|- Shaka Samvat||N/A|
|- Kali Yuga||3149–3150|
|Iranian calendar||574 BP – 573 BP|
|Islamic calendar||592 BH – 591 BH|
|Minguo calendar||1864 before ROC
|Seleucid era||359/360 AG|
|Thai solar calendar||590–591|
Year 48 (XLVIII) was a leap year starting on Monday (link will display the full calendar) of the Julian calendar. At the time, it was known as the Year of the Consulship of Vitellius and Poplicola (or, less frequently, year 801 Ab urbe condita). The denomination 48 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.
- Consuls are Aulus Vitellius and Lucius Vipstanus Poplicola.
- The emperor Claudius invests Agrippa II with the office of superintendent of the Temple in Jerusalem.
- After the execution of his wife Messalina, Claudius gets senatorial approval to marry his niece, Agrippina the Younger.
- Vitellius is a Roman Consul.
- Publius Ostorius Scapula, governor of Britain, announces his intention to disarm all Britons south and east of the Trent and Severn. The Iceni, an independent, allied kingdom within that area, revolt but are defeated. Ostorius then moves against the Deceangli in north Wales, but is forced to abandon the campaign to deal with a revolt among the allied Brigantes.
- Gallic nobles are admitted to the Roman Senate. Claudius grants the rights of citizenship to the Aedui.
- The Hsiung-nu empire dissolves.
- The emperor of China, Guang Wudi (Kouang Wou-Ti), restores Chinese domination of Inner Mongolia. The Xiongnu are made confederates and guard the Northern border of the empire.
- Probable date of the Apostolic Council. Paul of Tarsus begins his first mission (approximate date, see 47).
- According to Christian legend, Martha travels to Avignon.
- Ts'ai Lun, Chinese researcher and inventor of paper (d. 121)
- Ulpia Marciana, sister of emperor Trajan (d. 112)