A novel strain, designated Y1A-10 4-9-1^T, with Gram-stain-positive and rod-shaped cells, was isolated from paddy soil in Yingtan, Jiangxi, China. Cells were 0.15–0.2μm wide and 1.5–3.3μm long. The optimal growth temperature was 30°C and the optimal pH was 7.0. Phylogenetic analysis based on 16S rRNA gene sequences indicated that the novel strain is closely related to Propionicimonas paludicola JCM 11933^T (98.57%). The genomic DNA G+C content was 63.9 mol%. The predominant menaquinone was MK-9(H₄) and meso-diaminopimelic acid was present in the cell-wall peptidoglycan layer. The major polar lipids were diphosphatidylglycerol, one unidentified phospholipid and two unidentified lipids. The dominant cellular fatty acids detected were anteiso-C_15:0 and iso-C_16:0. The phylogenetic and phenotypic results supported that strain Y1A-10 4-9-1^T is a novel species of the genus Propionicimonas , for which the name Propionicimonas ferrireducens sp. nov. is proposed. The type strain is Y1A-10 4-9-1^T (=CCTCC AB 2016249^T=KCTC 15566^T=LMG 29810^T).