Oncostatin-M-specific receptor subunit beta (OSMRβ), also known as Interleukin-31 receptor subunit beta (IL-31RB), is the beta subunit of the type II OSM receptor, which is a heterodimer of gp130 and OSMRβ. OSMRβ associates with the low-affinity OSM·gp130 complex to form a high-affinity heterodimeric receptor that is capable of transducing OSM-specific signaling events.