|Centuries:||5th century – 6th century – 7th century|
|Decades:||560s 570s 580s – 590s – 600s 610s 620s|
|Years:||595 596 597 – 598 – 599 600 601|
|598 by topic|
|State leaders – Sovereign states|
|Birth and death categories|
|Births – Deaths|
|Establishment and disestablishment categories|
|Establishments – Disestablishments|
|Ab urbe condita||1351|
|Chinese calendar||丁巳年 (Fire Snake)
3294 or 3234
— to —
戊午年 (Earth Horse)
3295 or 3235
|- Vikram Samvat||654–655|
|- Shaka Samvat||520–521|
|- Kali Yuga||3699–3700|
|Iranian calendar||24 BP – 23 BP|
|Islamic calendar||25 BH – 24 BH|
|Minguo calendar||1314 before ROC
|Seleucid era||909/910 AG|
|Thai solar calendar||1140–1141|
Year 598 (DXCVIII) was a common year starting on Wednesday (link will display the full calendar) of the Julian calendar. The denomination 598 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 30 – Balkan Campaign: The Avars lift the siege at the fortress city of Tomis (modern Romania). A Byzantine army under Comentiolus cross the Balkan Mountains and marched along the Danube River to Zikidiba.
- The Avars route the Byzantine forces of Comentiolus (south of Haemus Mons) and capture Drizipera (Thrace). A large part of their troops is killed by the plague after many cities are devastated in the Balkan Peninsula.
- Emperor Maurice pays tribute to the Avars and concludes a treaty with their leader Bayan I, allowing Byzantine expeditions in Wallachia. He reorganises his army and strengthens the Long Walls (west of Constantinople).
- Maurice makes peace with king Agilulf, conceding northern Italy. Pope Gregory I the Great negotiates a truce, ending 30 years of Lombard terror. Agilulf expands the Lombard Kingdom by occupying Sutri and Perugia.
- Battle of Catraeth: The Gododdin under Mynyddog Mwynfawr, Brythonic king of Hen Ogledd ("The Old North"), defeat the Angles of Bernicia and Deira at the stronghold of Catraeth in Northern England (approximate date).
- August 4 – Goguryeo War: Emperor Wéndi orders his youngest son, Yang Liang (assisted by the co-prime minister Gao Jiong), to conquer Goguryeo (Korea) during the rainy season, with a Chinese army (300,000 men).
- The Chinese fleet engage in battle against the Goguryeo fleet (50,000 men) under admiral Gang Yi-sik, and is destroyed in the Bohai Sea. During the invasion the Sui forces are all defeated and Yang Liang is forced to retreat.
- King Yeongyang sends an embassy to Daxing, Wéndi accepts a peace agreement with Goguryeo. He claims a hollow victory, as the Sui Dynasty lost nearly 90% of his army and navy during the disastrous campaign.
- Missionaries convert the Anglo-Saxons to Christianity throughout much of what later would be the British Isles (approximate date).
- The Guoqing Temple is build on Mount Tiantai (Zhejiang) and becomes the site for teachings of Chinese Buddhism.
- Dou Dexuan, high official of the Tang Dynasty (d. 666)
- Du Fuwei, rebel leader during the Sui Dynasty (d. 624)
- Pingyang, princess of the Tang Dynasty (d. 623)
- Tai Zong, emperor of the Tang Dynasty (d. 649)
- Áed mac Ainmuirech, High King of Ireland
- Dallán Forgaill, Christian Irish poet
- Wideok, king of Baekje (Korea)
- Whitby (1998), p. 162
- Pohl (2002), p. 154
- Whitby (1998), p. 163