Ferrocyanide, wanda kuma aka sani da hexacyanoferrate (II), wani fili ne da ya ƙunshi ƙarfe, carbon, nitrogen, da potassium. Tsarin sinadaransa shine K4[Fe(CN)6]. Ferrocyanide sau da yawa ana amfani dashi azaman reagent a cikin ilmin sunadarai, da kuma samar da pigments, dyes, da magunguna. Yana da barga, mara wari, kuma fili mara guba wanda galibi ana samun shi azaman foda mai launin rawaya.