1340 (MCCCXL) was a leap year starting on Saturday of the Julian calendar, the 1340th year of the Common Era (CE) and Anno Domini (AD) designations, the 340th year of the 2nd millennium, the 40th year of the 14th century, and the 1st year of the 1340s decade. As of the start of 1340, the Gregorian calendar was 8 days ahead of the Julian calendar, which was the dominant calendar of the time.

Millennium: 2nd millennium
Centuries: 13th century14th century15th century
Decades: 1310s  1320s  1330s  – 1340s –  1350s  1360s  1370s
Years: 1337 1338 133913401341 1342 1343
1340 in other calendars
Gregorian calendar1340
MCCCXL
Ab urbe condita2093
Armenian calendar789
ԹՎ ՉՁԹ
Assyrian calendar6090
Balinese saka calendar1261–1262
Bengali calendar747
Berber calendar2290
English Regnal year13 Edw. 3 – 14 Edw. 3
Buddhist calendar1884
Burmese calendar702
Byzantine calendar6848–6849
Chinese calendar己卯(Earth Rabbit)
4036 or 3976
    — to —
庚辰年 (Metal Dragon)
4037 or 3977
Coptic calendar1056–1057
Discordian calendar2506
Ethiopian calendar1332–1333
Hebrew calendar5100–5101
Hindu calendars
 - Vikram Samvat1396–1397
 - Shaka Samvat1261–1262
 - Kali Yuga4440–4441
Holocene calendar11340
Igbo calendar340–341
Iranian calendar718–719
Islamic calendar740–741
Japanese calendarRyakuō 3
(暦応3年)
Javanese calendar1252–1253
Julian calendar1340
MCCCXL
Korean calendar3673
Minguo calendar572 before ROC
民前572年
Nanakshahi calendar−128
Thai solar calendar1882–1883
Tibetan calendar阴土兔年
(female Earth-Rabbit)
1466 or 1085 or 313
    — to —
阳金龙年
(male Iron-Dragon)
1467 or 1086 or 314

Events change