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930 in various calendars
Gregorian calendar	930; CMXXX
Ab urbe condita	1683
Armenian calendar	379; ԹՎ ՅՀԹ
Assyrian calendar	5680
Balinese saka calendar	851–852
Bengali calendar	337
Berber calendar	1880
Buddhist calendar	1474
Burmese calendar	292
Byzantine calendar	6438–6439
Chinese calendar	己丑年 (Earth Ox); 3627 or 3420; — to —; 庚寅年 (Metal Tiger); 3628 or 3421
Coptic calendar	646–647
Discordian calendar	2096
Ethiopian calendar	922–923
Hebrew calendar	4690–4691
Hindu calendars
- Vikram Samvat	986–987
- Shaka Samvat	851–852
- Kali Yuga	4030–4031
Holocene calendar	10930
Iranian calendar	308–309
Islamic calendar	317–318
Japanese calendar	Enchō 8; (延長８年)
Javanese calendar	829–830
Julian calendar	930; CMXXX
Korean calendar	3263
Minguo calendar	982 before ROC; 民前982年
Nanakshahi calendar	−538
Seleucid era	1241/1242 AG
Thai solar calendar	1472–1473
Tibetan calendar	阴土牛年; (female Earth-Ox); 1056 or 675 or −97; — to —; 阳金虎年; (male Iron-Tiger); 1057 or 676 or −96

Millennium:	1st millennium
Centuries:	9th century; 10th century ; 11th century;
Decades:	910s; 920s; 930s ; 940s; 950s;
Years:	927; 928; 929; 930 ; 931; 932; 933;

Year 930 (CMXXX) was a common year starting on Friday (link will display the full calendar) of the Julian calendar.

Events

The Althing, the parliament of Iceland, is established at þingvellir ("Thing Fields"). Chieftains from various tribes gather for 2 weeks at a thing (assembly) 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 the north-east of England, after Æthelstan grants the lands to the Bishop of Durham.
Gilbert, Duke of Lorraine, besieges Douai in West Francia.

January 11 – Sack of Mecca: The Qarmatians, led by Abu Tahir al-Jannabi, sack Mecca, desecrating the Zamzam Well and carrying off the Black Stone to their homeland in Eastern Arabia.^[1]
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 of Japan, 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 Liao dynasty (Khitan) Emperor Taizong, leaves for China.

^ Halm, Heinz (1991). Das Reich des Mahdi: Der Aufstieg der Fatimiden [The Empire of the Mahdi: The Rise of the Fatimids] (in German). Munich: C. H. Beck. pp. 229–230. ISBN 978-3-406-35497-7.