1491 (MCDXCI) was a common year starting on Saturday of the Julian calendar, the 1491st year of the Common Era (CE) and Anno Domini (AD) designations, the 491st year of the 2nd millennium, the 91st year of the 15th century, and the 2nd year of the 1490s decade. As of the start of 1491, the Gregorian calendar was 9 days ahead of the Julian calendar, which was the dominant calendar of the time.

Millennium: 2nd millennium
Centuries: 14th century15th century16th century
Decades: 1460s  1470s  1480s  – 1490s –  1500s  1510s  1520s
Years: 1488 1489 149014911492 1493 1494
1491 in other calendars
Gregorian calendar1491
MCDXCI
Ab urbe condita2244
Armenian calendar940
ԹՎ ՋԽ
Assyrian calendar6241
Balinese saka calendar1412–1413
Bengali calendar898
Berber calendar2441
English Regnal yearHen. 7 – 7 Hen. 7
Buddhist calendar2035
Burmese calendar853
Byzantine calendar6999–7000
Chinese calendar庚戌(Metal Dog)
4187 or 4127
    — to —
辛亥年 (Metal Pig)
4188 or 4128
Coptic calendar1207–1208
Discordian calendar2657
Ethiopian calendar1483–1484
Hebrew calendar5251–5252
Hindu calendars
 - Vikram Samvat1547–1548
 - Shaka Samvat1412–1413
 - Kali Yuga4591–4592
Holocene calendar11491
Igbo calendar491–492
Iranian calendar869–870
Islamic calendar896–897
Japanese calendarEntoku 3
(延徳3年)
Javanese calendar1408–1409
Julian calendar1491
MCDXCI
Korean calendar3824
Minguo calendar421 before ROC
民前421年
Nanakshahi calendar23
Thai solar calendar2033–2034
Tibetan calendar阳金狗年
(male Iron-Dog)
1617 or 1236 or 464
    — to —
阴金猪年
(female Iron-Pig)
1618 or 1237 or 465

Births change