A bacterial strain, 5YN9-8(T), was isolated from a peat layer in Yongneup, Republic of Korea. It was strictly aerobic, Gram-negative, non-motile, short rod- or coccus-shaped and produced ivory-pigmented colonies. Results of 16S rRNA gene sequence analyses indicated a close relationship between this isolate and Kaistia granuli Ko04(T) (97.2 % similarity) and Kaistia adipata Chj404(T) (96.2 % similarity), members of the order Rhizobiales within the Alphaproteobacteria. Predominant cellular fatty acids of strain 5YN9-8(T) were C(18 : 1)omega7c, C(18 : 0), C(19 : 0)omega8c cyclo and C(16 : 0). The DNA G+C content was 67.0 mol%. Phylogenetic, phenotypic and chemotaxonomic data accumulated in this study revealed that the isolate represents a novel species of the genus Kaistia, for which the name Kaistia soli sp. nov. is proposed; strain 5YN9-8(T) (=KACC 12605(T) =DSM 19436(T)) is the type strain.