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1003 in various calendars
Gregorian calendar	1003; MIII
Ab urbe condita	1756
Armenian calendar	452; ԹՎ ՆԾԲ
Assyrian calendar	5753
Balinese saka calendar	924–925
Bengali calendar	410
Berber calendar	1953
English Regnal year	N/A
Buddhist calendar	1547
Burmese calendar	365
Byzantine calendar	6511–6512
Chinese calendar	壬寅年 (Water Tiger); 3700 or 3493; — to —; 癸卯年 (Water Rabbit); 3701 or 3494
Coptic calendar	719–720
Discordian calendar	2169
Ethiopian calendar	995–996
Hebrew calendar	4763–4764
Hindu calendars
- Vikram Samvat	1059–1060
- Shaka Samvat	924–925
- Kali Yuga	4103–4104
Holocene calendar	11003
Igbo calendar	3–4
Iranian calendar	381–382
Islamic calendar	393–394
Japanese calendar	Chōhō 5; (長保５年)
Javanese calendar	905–906
Julian calendar	1003; MIII
Korean calendar	3336
Minguo calendar	909 before ROC; 民前909年
Nanakshahi calendar	−465
Seleucid era	1314/1315 AG
Thai solar calendar	1545–1546
Tibetan calendar	阳水虎年; (male Water-Tiger); 1129 or 748 or −24; — to —; 阴水兔年; (female Water-Rabbit); 1130 or 749 or −23

Millennium:	2nd millennium
Centuries:	10th century; 11th century ; 12th century;
Decades:	980s; 990s; 1000s ; 1010s; 1020s;
Years:	1000; 1001; 1002; 1003 ; 1004; 1005; 1006;

Year 1003 (MIII) was a common year starting on Friday (link will display the full calendar) of the Julian calendar.

Events

February 9 – Boleslaus III is restored to authority with armed support from Duke Bolesław I (the Brave) of Poland. The following months, Boleslaus' brothers Jaromír and Oldřich flee to Germany and place themselves under the protection of King Henry II, while Boleslaus orders the massacre of his Bohemian leading nobles at Vyšehrad.
German–Polish War: Bolesław I annexes Bohemia and parts of Moravia (modern Slovakia). German nobles under Henry of Schweinfurt revolt against Henry II (who has been promised the Duchy of Bavaria).
Count Oliba (Taillefer) Ripoll. Oliba takes up the Benedictine habit at the Monastery of Santa Maria de Ripoll.
King Robert II (the Pious) invades Burgundy, but fails. After this fiasco Robert repudiates his second wife, Bertha of Burgundy, and marries Constance of Arles who becomes queen consort of France.
King Rudolph III of Burgundy invests Humbert I (the White-Handed) with the domains of the Duchy of Aosta. He becomes the first count of the House of Savoy.
King Stephen I of Hungary invades Transylvania (modern Romania) and establishes the Diocese of Transylvania (approximate date).
Battle of Albesa: Muslim forces of the Caliphate of Cordoba defeat the northern Christian armies of León, Pamplona and Castile.^[1]

King Sweyn I (Forkbeard) lands with a Danish Viking fleet in East Anglia, ravaging the countryside. Northumbria surrenders to him (approximate date).

Emperor Sheng Zong of the Khitan-led Liao Dynasty leads an expedition into Mongolia and subdues the Zubu tribe who are forced to pay an annual tribute.

May 12 – Pope Sylvester II dies after a 4-year pontificate. He is succeeded by John XVII as the 140th pope of the Catholic Church.
November 6 – John XVII dies after a pontificate of about 7 months and is buried in the Lateran Basilica at Rome.
Heribert, archbishop of Cologne, founds Deutz Abbey at Deutz (Germany).