Philoxenus of Mabbug (Syriac: ܐܟܣܢܝܐ ܡܒܘܓܝܐ, Aksenāyâ Mabûḡāyâ) (died 523), also known as Xenaias and Philoxenus of Hierapolis, was one of the most notable Syriac prose writers during the Byzantine period and a vehement champion of Miaphysitism.