As　a　contribution　to　the　graphene-based　nanoferrite　composites,　this　article　is　intended　to　present　Mn,　Co,　and　Co-Mn　nanoferrites　for　the　preparation　and　investigation　of　such　samples.　Nanoparticles　of　Co　ferrite,　Mn　ferrite,　and　Co-Mn　ferrite　were　chemically　synthesized　by　the　coprecipitation　method.　The　composites　of　ferrite/graphene　were　made　by　incorporating　weight　ratios　of　25%　graphene　to　75%　ferrite.　Various　structural　and　characterizing　investigations　of　ferrite　samples　and　ferrite/graphene　composites　were　performed,　including　XRD,　EDX,　SEM,　VSM　hysteresis　loops,　AC　conductivity,　and　dielectric　behavior.　The　investigations　ensured　the　formation　of　the　intended　nanoferrite　powders,　each　having　a　single-phase　crystal　structure　with　no　undesired　phases　or　elements.　All　samples　exhibit　a　soft　magnetic　behavior.　They　show　a　semiconducting　behavior　of　AC　electrical　conductivity　as　well.　This　was　proved　by　the　temperature　dependence　of　the　AC＇s　electrical　conductivity.　Whereas　the　dielectric　function　and　loss　tangent　show　an　expected,　well-explained　behavior,　the　ferrite/graphene　composite　samples　have　lower　saturation　magnetization　values,　lower　AC　conductivity,　and　dielectric　constant　values　than　the　pure　ferrites　but　still　have　the　same　behavior　trends　as　those　of　the　pure　ferrites.　The　values　obtained　may　represent　steps　on　developing　new　materials　for　expected　applications,　such　as　manufacturing　supercapacitors　and/or　improved　battery　electrodes.