Branchinella alachua is a species of crustacean in the family Thamnocephalidae.

It was described in 1953 by Ralph W. Dexter based on material collected in 1947 by I. J. Cantrall; 11 male individuals of the new species were discovered among Cantrall's collection of Streptocephalus seali.

[2] B. alachua is only known from the type locality, a temporary pool in Alachua County, Florida, from which its specific epithet derives.

[2] It is listed as an endangered species on the IUCN Red List.

This Branchiopoda-related article is a stub.