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|984 by topic|
|Ab urbe condita||1737|
|Balinese saka calendar||905–906|
|Chinese calendar||癸未年 (Water Goat)
3680 or 3620
— to —
甲申年 (Wood Monkey)
3681 or 3621
|- Vikram Samvat||1040–1041|
|- Shaka Samvat||905–906|
|- Kali Yuga||4084–4085|
|Japanese calendar||Eikan 2
|Minguo calendar||928 before ROC
|Seleucid era||1295/1296 AG|
|Thai solar calendar||1526–1527|
1110 or 729 or −43
— to —
1111 or 730 or −42
|Wikimedia Commons has media related to 984.|
- Spring – The German boy-king Otto III (4-years old) is seized by the deposed Henry II (the Wrangler), duke of Bavaria, who has recovered his duchy and claims the regency as a member of the Ottonian Dynasty. But Henry is forced to hand over Otto to his mother, Empress consort Theophanu.
- King Ramiro III loses his throne to Bermudo II (the rival king of Galicia), who becomes also ruler of the entire Kingdom of León (modern-day Spain).
- Fall – Emperor En'yū abdicates the throne in favor of his 16-year-old son Kazan after a 15-year reign. En'yū retires and becomes a Buddhist priest.
- Qiao Weiyue, an Chinese engineer, innovates the first known use of the double-gated canal pound lock during the Song Dynasty, for adjusting different water levels in segments of the Grand Canal in China.
- August 20 – Pope John XIV dies a prisoner in the Castel Sant'Angelo at Rome after a 1-year reign, having either been murdered of starved to death.
- Anti-Pope Boniface VII returns from Constantinople and gains support from the powerful Roman Crescentii family. He takes hold of the papal throne.
- Abu al-Qasim Muhammad, founder of the Abbadid Dynasty (d. 1042)
- Choe Chung, Korean Confucian scholar and poet (d. 1068)
- July 7 – Crescentius (the Elder), politician and aristocrat
- August 1 – Æthelwold, bishop of Winchester
- August 20 – John XIV, pope of the Catholic Church
- September 7 – Dietrich I, bishop of Metz
- September 9 – Warin, archbishop of Cologne
- Buluggin ibn Ziri, ruler (emir) of the Zirid Dynasty
- Domnall Claen, king of Leinster (Ireland)
- Edith of Wilton, English princess and abbess
- Eochaid Ua Floinn, Irish poet (approximate date)
- Gerberga, Frankish queen (approximate date)
- Jordan, bishop of Poland (or 982)
- Miró III, count of Cerdanya and Besalú (b. 920)
- Ragnhild Eriksdotter, Norse Viking noblewoman
- Shi Shouxin, Chinese general (b. 928)