Herpesvirus entry mediator (HVEM), also known as tumor necrosis factor receptor superfamily member 14 (TNFRSF14), is a human cell surface receptor of the TNF-receptor superfamily encoded by the TNFRSF14 gene. Mutations in this protein have been recurrently been associated to cases of diffuse large B-cell lymphoma and pediatric-type follicular lymphoma. This receptor was identified as a cellular mediator of herpes simplex virus (HSV) entry. Binding of HSV viral envelope glycoprotein D (gD) to this receptor protein has been shown to be part of the viral entry mechanism.