Billbraya is a genus of parasitic alveolates in the phylum Apicomplexia. It contains a single recognised species, Billbraya australis.
This genus was described in 1990 by Paperna and Landau.[1] The genus is named after the parasitologist Robert ("Bill") Bray.
While merogony mostly occurs in the erythrocytes (typically 2 parasites per cell and up to 95% infection rates) it may also occur in the monocytes.