Stenotrophomonas daejeonensis is a Gram-negative gammaproteobacterium in the family Xanthomonadaceae, first isolated from soil samples collected in Daejeon, South Korea. It is aerobic, rod-shaped, and motile by polar flagella. Like other Stenotrophomonas species, it exhibits broad enzymatic activity and has been isolated from diverse environments including soils, water, and clinical samples.