|930 by topic|
|Ab urbe condita||1683|
|Balinese saka calendar||851–852|
|Chinese calendar||己丑年 (Earth Ox)|
3626 or 3566
— to —
庚寅年 (Metal Tiger)
3627 or 3567
|- Vikram Samvat||986–987|
|- Shaka Samvat||851–852|
|- Kali Yuga||4030–4031|
|Japanese calendar||Enchō 8|
|Minguo calendar||982 before ROC|
|Seleucid era||1241/1242 AG|
|Thai solar calendar||1472–1473|
1056 or 675 or −97
— to —
1057 or 676 or −96
Year 930 (CMXXX) was a common year starting on Friday (link will display the full calendar) of the Julian calendar.
- 17 June (traditional date) – The Althing, the parliament of Iceland, is established at þingvellir ("Thing Fields"). Chieftains from various tribes assemble for 2 weeks (at a thing) to settle disputes, arrange marriages, etc.; it continues in existence into the 21st century, as the world's oldest parliament of the Icelandic Commonwealth.
- Bishopwearmouth is formed and settled in England, after Æthelstan grants the lands to the Bishop of Durham.
- Gilbert, Duke of Lorraine besieges Douai in West Francia.
- Hajj – Qarmatians, led by Abu Tahir al-Jannabi, sack Mecca, desecrating the Zamzam Well, and carrying off the Black Stone.
- Mardavij ibn Ziyar is sent by Asfar ibn Shiruya along with his brother Shirzad, to capture the fortress of Shamiran in Tarom (Northern Iran), the capital of the Sallarid ruler Muhammad ibn Musafir. During the siege Mardavij is persuaded to revolt against Asfar, by letters from Makan ibn Kaki. With the help of the sons of the Sallarid, he kills other members of his tribe, including Shirzad. Mardavij founds the Ziyarid Dynasty and becomes the ruler of Asfar's former territories, which include Rey, Qazvin, Zanjan, Abhar, Qom and Karaj.
- October 16 – Emperor Daigo, being fatally ill, abdicates in favor of his 7-year-old son Suzaku, after a 33-year reign. He enters the Buddhist priesthood, but dies shortly after. Former Emperor Uda (Daigo's father), remains the power behind the Japanese throne (until 931).
- The independent Korean island state of Usan-guk becomes a protectorate of Goryeo.
- Yelü Bei, prince and elder brother of the Khitan Emperor Tai Zong, leaves for China.
- Alferius, Italian abbot and saint (d. 1050)
- Boleslaus II, duke of Bohemia (d. 999)
- Gisulf I, prince of Salerno (d. 977)
- Herbert of Wetterau, German nobleman (d. 992)
- Lambert of Chalon, Frankish nobleman (d. 978)
- Liudolf, duke of Swabia (approximate date) (d. 957)
- Mieszko I, prince of Poland (approximate date) (d. 992)
- Nikon the Metanoeite, Byzantine monk (d. 998)
- Odo I, German nobleman (approximate date) (d. 993)
- Ya'qub ibn Killis, Fatimid vizier (d. 991)
- Zhang Mi, Chinese Ci lyric poet (d. unknown)
- May 31 – Liu Hua, princess of Southern Han (b. 896)
- June 19 – Xiao Qing, chancellor of Later Liang (b. 862)
- June 20 – Hucbald, Frankish monk and music theorist
- October 26 – Li Qi, chancellor of Later Liang (b. 871)
- November 19 – Yan Keqiu, Chinese chief strategist
- December 2 – Ma Yin, Chinese warlord and king (b. 853)
- Amoghavarsha II, ruler of Rashtrakuta (India)
- García II Sánchez, duke of Gascony (approximate date)
- Sharwin II, ruler of the Bavand Dynasty (Iran)
- Xia Luqi, general of Later Tang (b. 882)
- Abū Kāmil Shujāʿ ibn Aslam, Egyptian mathematician (b. c. 850)
- Óengus mac Óengusa, Irish poet and Chief Ollam of Ireland