Accumulated data on assessment of genome of bacteria from Brucella genus and Rhizobiaceae family (results of sequencing, DNA-rRNA hybridization, 16S rRNA gene sequencing etc.) as well as their phenotypic characteristics (first of all, composition of cell fatty acids) were summarized. Data point to phylogenetic proximity of these bacteria and possibility to unite them in one Rhizobiaceae family together with the closest relatives of Brucella--first of all, with bacteria from Ochrobactrum genus). This seems to be more objective than recreation of Brucellaceae family (Rhizobiales order) with genera Brucella, Ochrobactrum and, possibly, others.