Paramyxovirus nau'in kwayar cuta ce da ke cikin dangin Paramyxoviridae. Wannan dangin ƙwayoyin cuta sun haɗa da wasu mahimman ƙwayoyin cuta na ɗan adam da na dabbobi, irin su cutar kyanda, ƙwayar cuta ta mumps, ƙwayar cuta ta numfashi (RSV), cutar parainfluenza, da cutar cutar Newcastle. Paramyxoviruses ana siffanta su da kwayar halittar RNA mai madauri guda ɗaya da ambulaf wanda ya ƙunshi glycoproteins na saman. Wadannan ƙwayoyin cuta na iya haifar da cututtuka daban-daban, ciki har da cututtuka na numfashi, kyanda, mumps, da parainfluenza.