This issue of Hematology/Oncology Clinics of North America, devoted to Multiple Myeloma, is edited by Dr. Kenneth C. Anderson. Articles in this issue include: Monoclonal Gammopathy of Undetermined Significance and Smoldering Multiple Myeloma; Diagnosis and Risk Stratification in Myeloma; Treatment of Newly Diagnosed Transplant Eligible Patients; Treatment of Newly Diagnosed Transplant Ineligible Patients; Treatment of Relapsed/Refractory Myeloma; Maintenance Therapy; Novel Targeted Therapies; Novel Immune-based Therapies; Allotransplantation in Myeloma; and Waldenstrom's Macroglobulinemia.