E1b1b

Haplogroup E-M215
Possible time of origin	42,600
Possible place of origin	North Africa or Horn of Africa
Coalescence age	{{{TMRCA}}}
Ancestor	Haplogroup E-P2
Descendants	E-M35, E-M281
Defining mutations	M215, most often co-distributed with M35

E-M215, also known as E1b1b and formerly E3b, is a major human Y-chromosome DNA haplogroup. It is a division of the macro haplogroup E-M96, which is defined by the single-nucleotide polymorphism (SNP) mutation M215. In other words, it is one of the major patrilineages of humanity, linking from father-to-son back to a common male-line ancestor ("Y-chromosomal Adam"). It is a subject of discussion and study in genetics as well as genetic genealogy, archaeology, and historical linguistics.

The E-M215 haplogroup has two ancient branches that contain all known modern E-M215, E-M35 and E-M281 subclades. Of the latter two, the only branch that has been confirmed in a native population outside of Ethiopia is E-M35. E-M35 in turn has two known branches, haplogroup E-V68 and haplogroup E-Z827, which contain by far the majority of all modern E-M215 carrying men. E-V68 and E-V257 have been found in highest numbers in North Africa and the Horn of Africa, but also in lower numbers in parts of the Middle East and Europe, and in isolated populations of Southern Africa.

The origins of E-M215 were dated by Cruciani in 2007 to about 22,400 years ago in the Horn of Africa. E-M35 was dated by Batini in 2015 to between 15,400 and 20,500 years ago. In June 2015, Trombetta et al. reported a previously unappreciated large difference in the age between haplogroup E-M215 (38.6 kya; 95% CI 31.4-45.9 kya) and its sub-haplogroup E-M35 (25.0 kya; 95% CI 20.0-30.0 kya).

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