Rhyzobius gratus is a species of beetle of the family Coccinellidae. It is found in Indonesia (Western New Guinea).
Description Adults reach a length of about . They are similar to Rhyzobius violaceus, Rhyzobius gonzalezi and Rhyzobius luciae by the body size, shape and colouration.
Taxonomy The species was described by Julius Weise in 1918. His description was probably based on a single female. In a revision of the genus published in 2010, the species was treated as incertae sedis, since the holotype was not available for study.
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