100 BC

100 BC in various calendars
Gregorian calendar	100 BC; C BC
Ab urbe condita	654
Ancient Egypt era	XXXIII dynasty, 224
- Pharaoh	Ptolemy X Alexander, 8
Ancient Greek era	170th Olympiad (victor)¹
Assyrian calendar	4651
Balinese saka calendar	N/A
Bengali calendar	−692
Berber calendar	851
Buddhist calendar	445
Burmese calendar	−737
Byzantine calendar	5409–5410
Chinese calendar	庚辰年 (Metal Dragon); 2598 or 2391; — to —; 辛巳年 (Metal Snake); 2599 or 2392
Coptic calendar	−383 – −382
Discordian calendar	1067
Ethiopian calendar	−107 – −106
Hebrew calendar	3661–3662
Hindu calendars
- Vikram Samvat	−43 – −42
- Shaka Samvat	N/A
- Kali Yuga	3001–3002
Holocene calendar	9901
Iranian calendar	721 BP – 720 BP
Islamic calendar	743 BH – 742 BH
Javanese calendar	N/A
Julian calendar	N/A
Korean calendar	2234
Minguo calendar	2011 before ROC; 民前2011年
Nanakshahi calendar	−1567
Seleucid era	212/213 AG
Thai solar calendar	443–444
Tibetan calendar	阳金龙年; (male Iron-Dragon); 27 or −354 or −1126; — to —; 阴金蛇年; (female Iron-Snake); 28 or −353 or −1125

Millennium:	1st millennium BC
Centuries:	2nd century BC; 1st century BC ; 1st century;
Decades:	120s BC; 110s BC; 100s BC ; 90s BC; 80s BC;
Years:	103 BC; 102 BC; 101 BC; 100 BC ; 99 BC; 98 BC; 97 BC;

Year 100 BC was a year of the pre-Julian Roman calendar. At the time it was known as the Year of the Consulship of Marius and Flaccus (or, less frequently, year 654 Ab urbe condita) and the First Year of Tianhan.^[where?] The denomination 100 BC for this year has been used since the early medieval period, when the Anno Domini calendar era became the prevalent method in Europe for naming years.

Gregorian calendar	100 BC C BC
Ab urbe condita	654
Ancient Egypt era	XXXIII dynasty, 224
- Pharaoh	Ptolemy X Alexander, 8
Ancient Greek era	170th Olympiad (victor )¹
Assyrian calendar	4651
Balinese saka calendar	N/A
Bengali calendar	−692
Berber calendar	851
Buddhist calendar	445
Burmese calendar	−737
Byzantine calendar	5409–5410
Chinese calendar	庚辰年 (Metal Dragon) 2598 or 2391 — to — 辛巳年 (Metal Snake) 2599 or 2392
Coptic calendar	−383 – −382
Discordian calendar	1067
Ethiopian calendar	−107 – −106
Hebrew calendar	3661–3662
Hindu calendars
- Vikram Samvat	−43 – −42
- Shaka Samvat	N/A
- Kali Yuga	3001–3002
Holocene calendar	9901
Iranian calendar	721 BP – 720 BP
Islamic calendar	743 BH – 742 BH
Javanese calendar	N/A
Julian calendar	N/A
Korean calendar	2234
Minguo calendar	2011 before ROC 民前2011年
Nanakshahi calendar	−1567
Seleucid era	212/213 AG
Thai solar calendar	443–444
Tibetan calendar	阳金龙年 (male Iron-Dragon) 27 or −354 or −1126 — to — 阴金蛇年 (female Iron-Snake) 28 or −353 or −1125