|Centuries:||10th century · 11th century · 12th century|
|Decades:||1010s · 1020s · 1030s · 1040s · 1050s · 1060s · 1070s|
|Years:||1045 · 1046 · 1047 · 1048 · 1049 · 1050 · 1051|
|1048 by topic|
|Lists of leaders|
|Birth and death categories|
|Births – Deaths|
|Establishments and disestablishments categories|
|Establishments – Disestablishments|
|Ab urbe condita||1801|
|English Regnal year||N/A|
|Chinese calendar||丁亥年 (Fire Pig)|
3744 or 3684
— to —
戊子年 (Earth Rat)
3745 or 3685
|- Vikram Samvat||1104–1105|
|- Shaka Samvat||969–970|
|- Kali Yuga||4148–4149|
|Japanese calendar||Eishō 3|
|Minguo calendar||864 before ROC|
|Seleucid era||1359/1360 AG|
|Thai solar calendar||1590–1591|
|Wikimedia Commons has media related to 1048.|
- September 10 or September 18 – Battle of Kapetrou: Seljuks defeat a force of Byzantines and Georgians.
- Failed Byzantine attempt to reconquer Malta.
- Last Viking raid on the Kingdom of England; unsuccessful raiders flee to Flanders.
- King Edward the Confessor of England goes to war against Flanders, blockading the English Channel with a fleet based at Sandwich, Kent.
- Approximate date – The city of Oslo is founded by King Harald Hardrada of Norway.
- July 16 – Pope Benedict IX is driven from Rome by German troops, ending his third and final pontificate.
- July 17 – Pope Damasus II succeeds Benedict IX as the 151st pope.
- May 18 – Omar Khayyám, Persian poet, astronomer, mathematician, and philosopher (d. 1123)
- May 25 – Emperor Shenzong of China (d. 1085)
- June 16 – Sheikh Ahmad-e Jami, Persian Sufi and Sufi writer
- Alexius I Comnenus, Byzantine Emperor (d. 1118)
- Arwa al-Sulayhi, sovereign queen of Yemen (d. 1138)
- Palmer, Alan; Veronica (1992). The Chronology of British History. London: Century Ltd. pp. 50–51. ISBN 0-7126-5616-2.