Borrelia afzelii
Scientific classification
Domain:	Bacteria
Phylum:	Spirochaetota
Class:	Spirochaetia
Order:	Spirochaetales
Family:	Borreliaceae
Genus:	Borrelia
Species:	B. afzelii
Binomial name
Borrelia afzelii Manuela Marin Canica et al., 1994

Borrelia afzelii is a species of Borrelia endemic to parts of Eurasia where it is one of the causative agents of Lyme disease. It is transmitted by hard-bodied ticks of the Ixodes genus (Ixodes ricinus in Europe, and Ixodes persulcatus in temperate regions of Asia), infecting various wild mammals in nature.^[1]

Among 30 Borrelia known species, it is one of four which are likely to infect humans.^{[citation needed]} Dermatological manifestations are more common in Lyme disease caused by B. afzelii.^[1]

It is named after Swedish dermatologist Arvid Afzelius.^{[citation needed]}