|Centuries:||5th century – 6th century – 7th century|
|Decades:||500s 510s 520s – 530s – 540s 550s 560s|
|Years:||536 537 538 – 539 – 540 541 542|
|539 by topic|
|State leaders – Sovereign states|
|Birth and death categories|
|Births – Deaths|
|Establishment and disestablishment categories|
|Establishments – Disestablishments|
|Ab urbe condita||1292|
|Chinese calendar||戊午年 (Earth Horse)
3235 or 3175
— to —
己未年 (Earth Goat)
3236 or 3176
|- Vikram Samvat||595–596|
|- Shaka Samvat||461–462|
|- Kali Yuga||3640–3641|
|Iranian calendar||83 BP – 82 BP|
|Islamic calendar||86 BH – 85 BH|
|Minguo calendar||1373 before ROC
|Seleucid era||850/851 AG|
|Thai solar calendar||1081–1082|
Year 539 (DXXXIX) 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 Strategius without colleague (or, less frequently, year 1292 Ab urbe condita). The denomination 539 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.
- March – Gothic War: The Goths and the Burgundians recapture Mediolanum (modern Milan), after many months of siege, the city reaching the point of starvation. The Byzantine garrison (1,000 men) surrenders and is spared, but the inhabitants are massacred, (according to Procopius 300,000 people are murdered) and the city itself is destroyed.
- Belisarius, still besieging Ravenna, negotiates a treaty with Theodebert I (whose forces are suffering from dysentery) and the Franks retreat to Gaul. The Byzantine fleet controls the Adriatic Sea and blockade the port of the capital from supplies.
- Emperor Justinian I becomes alarmed by renewed barbarian incursions across the Danube frontier from the Slavs, the Bulgars, the Gepids, and the Avars.
- November 29 – Antioch is struck by an earthquake.
- Bertha, wife of Æthelberht of Kent
- Chilperic I, king of Neustria (approximate date)
- Maurice, emperor of the Byzantine Empire (d. 602)
- The Making of the Slavs (p. 190–226). Florin Curta, 2001. ISBN 978-0-511-49629-5