991

Millennium: 1st millennium
Centuries:
Decades:
Years:
991 in various calendars
Gregorian calendar991
CMXCI
Ab urbe condita1744
Armenian calendar440
ԹՎ ՆԽ
Assyrian calendar5741
Balinese saka calendar912–913
Bengali calendar398
Berber calendar1941
Buddhist calendar1535
Burmese calendar353
Byzantine calendar6499–6500
Chinese calendar庚寅年 (Metal Tiger)
3688 or 3481
    — to —
辛卯年 (Metal Rabbit)
3689 or 3482
Coptic calendar707–708
Discordian calendar2157
Ethiopian calendar983–984
Hebrew calendar4751–4752
Hindu calendars
 - Vikram Samvat1047–1048
 - Shaka Samvat912–913
 - Kali Yuga4091–4092
Holocene calendar10991
Iranian calendar369–370
Islamic calendar380–381
Japanese calendarShōryaku 2
(正暦2年)
Javanese calendar892–893
Julian calendar991
CMXCI
Korean calendar3324
Minguo calendar921 before ROC
民前921年
Nanakshahi calendar−477
Seleucid era1302/1303 AG
Thai solar calendar1533–1534
Tibetan calendar阳金虎年
(male Iron-Tiger)
1117 or 736 or −36
    — to —
阴金兔年
(female Iron-Rabbit)
1118 or 737 or −35
Statue of Byrhtnoth at Maldon (Essex)

Year 991 (CMXCI) was a common year starting on Thursday (link will display the full calendar) of the Julian calendar.