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This article is about the year 904. For the number, see 904 (number).
|Centuries:||9th century – 10th century – 11th century|
|Decades:||870s 880s 890s – 900s – 910s 920s 930s|
|Years:||901 902 903 – 904 – 905 906 907|
|904 by topic|
|State leaders – Sovereign states|
|Birth and death categories|
|Births – Deaths|
|Establishment and disestablishment categories|
|Establishments – Disestablishments|
|Ab urbe condita||1657|
|Chinese calendar||癸亥年 (Water Pig)
3600 or 3540
— to —
甲子年 (Wood Rat)
3601 or 3541
|- Vikram Samvat||960–961|
|- Shaka Samvat||826–827|
|- Kali Yuga||4005–4006|
|Japanese calendar||Engi 4
|Minguo calendar||1008 before ROC
|Seleucid era||1215/1216 AG|
|Thai solar calendar||1446–1447|
- The Byzantines under Andronikos Doukas defeat the Arab garrisons of Mopsuestia and Tarsos near Marash.
- Chang'an, the capital of Tang dynasty China and the largest city in the ancient world, is destroyed.
- September 22 – The warlord Zhu Quanzhong kills Emperor Zhaozong, the penultimate emperor of Tang dynasty China, after seizing control of the imperial government.
- The Abbasids invade the Tulunid emirate of Egypt.
- July 29 – Sack of Thessalonica: Saracen raiders under Leo of Tripoli sack Thessalonica, the Byzantine Empire's second-largest city, after a short siege, and plunder it for a week.
- In Portugal, for the third time in less than 30 years, the Christians take control of Coimbra, this time for almost a century.
- July 29 – The Bavarians kill an important leader (gyula or horka) of the Hungarian tribal confederation, Kurszán in an ambush.
- January 29 – Pope Sergius III succeeds Pope Leo V and the deposed Antipope Christopher (both of whom are murdered or exiled) as the 119th pope; he begins the era of the Pornocracy.
- January – Antipope Christopher the antipope
- October – Al-Qasim ibn Ubayd Allah, Abbasid vizier
- Zhaozong, 19th emperor of the Tang dynasty
- Erenfried I of Maasgau, Count of Bliesgau, Keldachgau and Bonngau and Count of Charmois
- Du Xunhe, Chinese poet
- Llywarch ap Hyfaidd. King of Dyfed, Wales
- Ki no Tomonori, early Heian waka poet
- Kurszán, partner ruler of the Magyars beside Árpád
- Harun ibn Khumarawayh, fourth Emir of the Tulunids
- Yahya ibn Al-Qassim, eighth Idrisid ruler and sultan of Morocco
- Zhang Jun, Tang dynasty chancellor
- Lady Zhang, wife of Zhu Quanzhong